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Hey everybody! So I am about a week away from getting my lift installed on my 2006 Limited Jeep Commander. I decided to go with a RR 2.25 lift kit for the front and the back, OME MD front struts, bilstein rear 4600 shocks and 1.5 inch spidertraxx spacers.

My question, before I go through with the lift, is if there is a significant difference in the performance, fit and installation of these different brand spacer lifts? I have seen people with Day star and Rough Country lifts as well, and wanted to know why people decided to go with one as opposed to another.

Thanks again for your help!!
 

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Hey everybody! So I am about a week away from getting my lift installed on my 2006 Limited Jeep Commander. I decided to go with a RR 2.25 lift kit for the front and the back, OME MD front struts, bilstein rear 4600 shocks and 1.5 inch spidertraxx spacers.

My question, before I go through with the lift, is if there is a significant difference in the performance, fit and installation of these different brand spacer lifts? I have seen people with Day star and Rough Country lifts as well, and wanted to know why people decided to go with one as opposed to another.

Thanks again for your help!!
Why 4600 rear shocks? Makes no sense, those are stock length.

You MUST have written that backwards with OME rear shocks and 4600 front struts. You really want to have longer rear shocks. Front should be stock length.


Have them clearance the gas tank skid so that you will get full droop in the rear. Otherwise your rear control arm will contact the skid.
 

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Why 4600 rear shocks? Makes no sense, those are stock length.

You MUST have written that backwards with OME rear shocks and 4600 front struts. You really want to have longer rear shocks.
Why?

You absolutely DO NOT need longer shocks in the rear for a Commander with a 2 inch lift.

If you want to install longer shocks in the rear, that's always an option - but it is not necessary.

People seem to have this misconception that having longer shocks (Bilstein 5100's for example) in the rear will raise your rear end and they absolutely will not do that by themselves, regardless of what setting you put them on.

They are just shocks, you will not raise your rear end the slightest bit by installing rear shocks that are longer than the OEM shocks - unless you specifically buy longer, load-leveling shocks, which are typically more expensive - or if you change the springs AND the shocks.

Bilstein 5100's - which are longer shocks, are not load-leveling shocks.

The fact of the matter is, unless you plan on installing an even larger lift in the future, like a 4 inch super-lift, there is no performance advantage or benefit gained by putting 5100's, or any other longer shock in the rear, unless you do hard-core rock-crawling on a regular basis, where your suspension in the rear may benefit from having more travel from a longer shock.

In that case, I can understand doing it - but for normal, everyday off-roading, there are no benefits gained from a longer shock.

The Off-road 4x4 shop who installed my 2 inch Rough Country lift kit, (Southern Performance in Virginia Beach, VA) which is a very reputable shop that specializes working specifically on 4x4's, would not install Bilstein 5100's on my Commander and actually recommended the Bilstein 4600 HD shocks & struts with my 2 inch lift (which is actually a 3 inch lift with my larger tires) and that's what I went with. I'm very satisfied with their performance and haven't had any issues whatsoever off-road or otherwise.

I understand that Bilstein 5100's actually do fit Commanders - despite Bilstein's website stating that they do not, but again, unless you plan on installing a lift of more than 3 inches or doing hard-core rock-crawling on a regular basis - what's the point?

If I was going to question anything about what the original poster said, I would ask him why he doesn't just go with Bilstein HD 4600 Shocks & Struts?

The quality that Bilstein offers is an upgrade over the OEM shocks & struts, so why not upgrade the front & rear suspension as opposed to just the rear?

Stock length or not, the Bilstein 4600's are a nice upgrade - and I am speaking from first hand experience.

Here are some pics after I had mine installed;









Here is a pic of my ride next to a bone-stock Commander to give you a little more perspective:

 

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Why?

You absolutely DO NOT need longer shocks in the rear for a Commander with a 2 inch lift.

If you want to install longer shocks in the rear, that's always an option - but it is not necessary.
I said you really want, not need longer rear shocks.

People seem to have this misconception that having longer shocks (Bilstein 5100's for example) in the rear will raise your rear end and they absolutely will not do that by themselves, regardless of what setting you put them on.





They are just shocks, you will not raise your rear end the slightest bit by installing rear shocks that are longer than the OEM shocks - unless you specifically buy longer, load-leveling shocks, which are typically more expensive - or if you change the springs AND the shocks.

Bilstein 5100's - which are longer shocks, are not load-leveling shocks.
I am familiar. I find that I have to correct people on that misconception constantly. The front struts, however, have varying lower spring perch height levels, which do allow you to lift the front end.+

The fact of the matter is, unless you plan on installing an even larger lift in the future, like a 4 inch super-lift, there is no performance advantage or benefit gained by putting 5100's, or any other longer shock in the rear, unless you do hard-core rock-crawling on a regular basis, where your suspension in the rear may benefit from having more travel from a longer shock.

In that case, I can understand doing it - but for normal, everyday off-roading, there are no benefits gained from a longer shock.

The Off-road 4x4 shop who installed my 2 inch Rough Country lift kit, (Southern Performance in Virginia Beach, VA) which is a very reputable shop that specializes working specifically on 4x4's, would not install Bilstein 5100's on my Commander and actually recommended the Bilstein 4600 HD shocks & struts with my 2 inch lift (which is actually a 3 inch lift with my larger tires) and that's what I went with. I'm very satisfied with their performance and haven't had any issues whatsoever off-road or otherwise.

I understand that Bilstein 5100's actually do fit Commanders - despite Bilstein's website stating that they do not, but again, unless you plan on installing a lift of more than 3 inches or doing hard-core rock-crawling on a regular basis - what's the point?
There is a benefit. the stock shocks are the travel limitation in stock form. More travel equals a better ride and better articulation offroad. If you are replacing shocks anyways while doing a lift, why not get longer shocks? The cost increase is minimal if any. I spent $75 per shock shipped on my 5125's (universal bilstein rear shocks in custom lengths). 4600's are usually around $70.

I'd imagine that the reason that your shop suggested 4600's in the rear was to reduce your droop so as to not contact the gas tank skid. They probably didn't want to mess with it and didn't want you to complain about the shock body hitting the skid. That or people like the idea of having matching shocks front and rear.

If I was going to question anything about what the original poster said, I would ask him why he doesn't just go with Bilstein HD 4600 Shocks & Struts?

The quality that Bilstein offers is an upgrade over the OEM shocks & struts, so why not upgrade the front & rear suspension as opposed to just the rear?

Stock length or not, the Bilstein 4600's are a nice upgrade - and I am speaking from first hand experience.
I agree. I love my bilsteins. Performance advantages of monotube vs twin tube shocks are pretty well documented. Seems odd to me to mix and match manufacturers shocks.


BTW I have front and rear bilstein 5100's, ROR rear springs.
 

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Hey everybody! So I am about a week away from getting my lift installed on my 2006 Limited Jeep Commander. I decided to go with a RR 2.25 lift kit for the front and the back, OME MD front struts, bilstein rear 4600 shocks and 1.5 inch spidertraxx spacers.

My question, before I go through with the lift, is if there is a significant difference in the performance, fit and installation of these different brand spacer lifts? I have seen people with Day star and Rough Country lifts as well, and wanted to know why people decided to go with one as opposed to another.

Thanks again for your help!!
I got the Daystar a while back, It was easy and has held up with no issues for 4 years. I don't do anything heavy though, I only wanted it for ground clearance

Why?

You absolutely DO NOT need longer shocks in the rear for a Commander with a 2 inch lift.

If you want to install longer shocks in the rear, that's always an option - but it is not necessary.
WEEELLLLLLL....

When I installed my 2" lift, I found myself having to buy longer rear shocks, because when I went over a speed bump at 10MPH, my rear shocks would fully extend... and it would extend hard!

That was my experience anyway.
 

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I got the Daystar a while back, It was easy and has held up with no issues for 4 years. I don't do anything heavy though, I only wanted it for ground clearance



WEEELLLLLLL....

When I installed my 2" lift, I found myself having to buy longer rear shocks, because when I went over a speed bump at 10MPH, my rear shocks would fully extend... and it would extend hard!

That was my experience anyway.
I'd say its definitely strongly recommended. If you don't then you just end up losing droop since your static height is now greater, and your shocks are the droop limitation in stock form...


Regarding the rr vs rc vs daystar, (which OP seems to have made a decision on already) I'd say in general people are suggesting to go with rr or rc. Daystar can have the potential to wear in and lose some height in the front from what ive read.
 

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I got the Daystar a while back, It was easy and has held up with no issues for 4 years. I don't do anything heavy though, I only wanted it for ground clearance

When I installed my 2" lift, I found myself having to buy longer rear shocks, because when I went over a speed bump at 10MPH, my rear shocks would fully extend... and it would extend hard!

That was my experience anyway.
What kind of rear shocks did you have?

I guess that can be attributed to the difference in components used in the Daystar 2 inch lift kit & Rough Country 2 inch lift kit, or, the difference in rear shocks used - or some combination of the two.

I've had ZERO problems on or off-road with my Bilstein 4600's and what equates to, a 3 inch lift.

Big Blue is quiet & agile.
 

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There is a benefit. the stock shocks are the travel limitation in stock form. More travel equals a better ride and better articulation offroad.
On paper, I understand that what you are saying is correct.

That being said, I question if there is really any noticeable performance difference.

How can you quantify it?

Internal components of the 4600's & 5100's are identical.

Would the average driver actually be able to notice that "more travel equals a better ride and better articulation while doing average every-day off-roading"?

I really doubt it, unless you are off-roading or rock-crawling in the most extreme of conditions.

luckyse7ens said:
I'd imagine that the reason that your shop suggested 4600's in the rear was to reduce your droop so as to not contact the gas tank skid. They probably didn't want to mess with it and didn't want you to complain about the shock body hitting the skid. That or people like the idea of having matching shocks front and rear.
I think the main reason is because the vast majority of websites & shop databases you go to in order to look up compatible off-road suspension parts for a Commander list Bilstein 5100's as not fitting Commanders - and that includes Bilstein's own company website.

In light of that, they probably made their recommendation to avoid any liability if the 5100's failed or malfunctioned for some reason; from the business owner's standpoint, I can completely understand it.

Until Bilstein updates their product information for the 5100's and refelcts on their own website that they do actually fit Commanders, I suspect that most reputable, well-established shops will do the same thing to avoid liability.
 

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On paper, I understand that what you are saying is correct.

That being said, I question if there is really any noticeable performance difference.

How can you quantify it?

Internal components of the 4600's & 5100's are identical.

Would the average driver actually be able to notice that "more travel equals a better ride and better articulation while doing average every-day off-roading"?

I really doubt it, unless you are off-roading or rock-crawling in the most extreme of conditions.
I had stock rear shocks on the XK with a lift and upgraded to 26" shocks. This increased my droop by 4". The stock shocks are 22" IIRC.

My wife noticed the difference right away, since droop more than doubled, and damping performance increased dramatically over worn out stockers. Not sure how to quantify how much the increased length effected her experience. (there is probably an inappropriate joke in there somewhere)


I'm not sure what average every day off roading means to you, fire roads or something I assume. Would the average driver notice that their tires did not leave the road surface as often? I'm not sure. Probably not? Would I notice? Of course. IMHO there is a performance improvement in my vehicle.


I'm not here to argue that if you already have nice new shocks like you have that you must spend the coin to get longer ones. I feel that you are defending your purchase in this way. I'm just saying that if you are buying shocks to install with a lift then there is no reason not to get the longer shocks in the rear.

BTW- I installed my lift myself. There is potential for several more inches of droop in the rear without a lift with longer than stock shocks.

If you are happy with your setup then great!

Internal components of the 4600's & 5100's are identical.
I thought the same for a long time, but valving can be different, and 5100's have digressive valving vs I think linear valving for the 4600's
 

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What kind of rear shocks did you have?

I guess that can be attributed to the difference in components used in the Daystar 2 inch lift kit & Rough Country 2 inch lift kit, or, the difference in rear shocks used - or some combination of the two.

I've had ZERO problems on or off-road with my Bilstein 4600's and what equates to, a 3 inch lift.

Big Blue is quiet & agile.
The stock ones as far as i know. Got the XK at 57k miles in 2011.
 

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The stock ones as far as i know. Got the XK at 57k miles in 2011.
So, I surmise your problem, where your rear shocks would fully extend and extend hard, was caused by the combination of your Daystar lift components being used in conjunction with your stock rear shocks.

57K miles 5 years ago. Nice.

What's your mileage now, 5 years later?
 

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I had stock rear shocks on the XK with a lift and upgraded to 26" shocks. This increased my droop by 4". The stock shocks are 22" IIRC.
1st off, please explain to me what you mean by droop.

Is this some technical term that I'm not familiar with?

Or is this slang for something else?

I've never heard of the term "droop" when talking about a vehicle's suspension system.

I thought the same for a long time, but valving can be different, and 5100's have digressive valving vs I think linear valving for the 4600's
The quote below is from a write up from the shock warehouse where they did a pretty lengthy comparison between the HD 4600 & the 5100. They do mention there could be a difference in the valving although they do not specify digressive & linear;

The Similarities: The 5100 series and the 4600 Heavy Duty shocks use the same technology internally. Both use the same internal valving and at stock height will ride the same (shocks for lifted trucks may use different valving settings in order to accommodate the extra weight of larger tires). Both shocks are pressurized with 360 psi of nitrogen to prevent shock fade and foaming of the shock oil. The outer construction of both shocks is identical as well with an extruded metal body rather for maximum strength and top of the line seals. The 5100 series and Heavy Duty 4600 series are both covered under Bilstein's limited lifetime warranty that protects against any manufacturer defects for the life of the shock.
The funny thing is when I put my Commander, year make & model in the Shock Warehouse's website under Bilstein products and hit search, the Bilstein HD 4600's are the only product that comes up.

I sent the Shock warehouse an e-mail about installing the 5100's on the rear of Commanders and asked them if they would fit the rear of my Commander or not (I gave them my lift information as well) and went on the explain that I know quite a few people who have installed them on Commanders. I'm curious to see what response I get from them.
 

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1st off, please explain to me what you mean by droop.

Is this some technical term that I'm not familiar with?

Or is this slang for something else?

I've never heard of the term "droop" when talking about a vehicle's suspension system.
Down travel from normal ride height.

The quote below is from a write up from the shock warehouse where they did a pretty lengthy comparison between the HD 4600 & the 5100. They do mention there could be a difference in the valving although they do not specify digressive & linear;

The funny thing is when I put my Commander, year make & model in the Shock Warehouse's website under Bilstein products and hit search, the Bilstein HD 4600's are the only product that comes up.

I sent the Shock warehouse an e-mail about installing the 5100's on the rear of Commanders and asked them if they would fit the rear of my Commander or not (I gave them my lift information as well) and went on the explain that I know quite a few people who have installed them on Commanders. I'm curious to see what response I get from them.
The digressive vs linear thing is something that I have come across recently. I installed 4600's in one of my other vehicles last night. There is definitely a difference between it and the 51xx's I have in the XK. Then again I have 5125's in the rear (universal fit available in varying lengths and valving options) so maybe that is the difference. My understanding is that the 4600 product range has changed over the years.



Not sure what shock warehouse is going to say. The suspensions and frames are the same when comparing wk and xk (excluding spring rates depending on options and sway bars)

Heres a document directly from Bilstein showing compatibility with XK's...



That being said I am not sure why they are implying that greater lift height will be achieved with an XK. Maybe spring rate differences on certain options? Not sure. I have mine set @ the highest setting. No issues. Expected ride height increase.


This has certainly become an engaging conversation!
 

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So, I surmise your problem, where your rear shocks would fully extend and extend hard, was caused by the combination of your Daystar lift components being used in conjunction with your stock rear shocks.
Seems reasonable. Certainly in my case going from stock 100k mile shocks to anything new would have been an improvement.
 

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Down travel from normal ride height.



The digressive vs linear thing is something that I have come across recently. I installed 4600's in one of my other vehicles last night. There is definitely a difference between it and the 51xx's I have in the XK. Then again I have 5125's in the rear (universal fit available in varying lengths and valving options) so maybe that is the difference. My understanding is that the 4600 product range has changed over the years.



Not sure what shock warehouse is going to say. The suspensions and frames are the same when comparing wk and xk (excluding spring rates depending on options and sway bars)

Heres a document directly from Bilstein showing compatibility with XK's...

That being said I am not sure why they are implying that greater lift height will be achieved with an XK. Maybe spring rate differences on certain options? Not sure. I have mine set @ the highest setting. No issues. Expected ride height increase.


This has certainly become an engaging conversation!
Indeed.

You're definitely teaching me a few things, which I appreciate.

Here is the link for the full article from the Shock Warehouse comparing the HD 4600's to the 5100's if you want to check it out:

Bilstein 5100 vs Heavy Duty 4600 - Shockwarehouse.com
 

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Seems reasonable. Certainly in my case going from stock 100k mile shocks to anything new would have been an improvement.
It was night and for me when I switched over to the Bilstein HD 4600 shocks & struts and I only had around 72,000 miles on my Commander when I had them installed.

I also replaced the rear coil springs with new factory OEM rear coils.

Alot of people told me I probably didn't need to, but, I just wanted to drop a new set of springs in since I was having the shocks replaced anyway.
 

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Indeed.

You're definitely teaching me a few things, which I appreciate.

Here is the link for the full article from the Shock Warehouse comparing the HD 4600's to the 5100's if you want to check it out:

Bilstein 5100 vs Heavy Duty 4600 - Shockwarehouse.com
Something that I noticed in that article:

(shocks for lifted trucks may use different valving settings in order to accommodate the extra weight of larger tires).
some of the 5100's have different valving.

Directly from the bilstein online catalog of the shock product # for the xk/wk:

Bilstein, Innovation and High Quality Since 1873

The monotube shocks feature a 46mm digressive piston with self-adjusting deflective disc valving.


Bilstein, Innovation and High Quality Since 1873

Bilstein B8 5100 shock absorbers have a gas pressure monotube designed specifically for lifted trucks, SUVs and Jeeps. The shocks feature a 46mm digressive piston with self-adjusting deflective disc valving. Bilstein B8 5100 shock absorbers offer superior damping ability that makes them ideal for heavy hauling or occasional off-road use, while maintaining an exceptional street ride.
It does not say that for the b6 4600 series yellow cans.


I only found this out very recently while deciding between 5100/5125/4600 shocks for another vehicle of mine. I was incorrectly telling people that they were internally the same for sometime now. They use the same "technology" and "pressure" but there are potential valving differences. I have not had an easy time tracking down specific valving information on the 5100s and 4600s but the 5125's are expressly stated which is nice. See attached pdf for details on different 5125 options if you are curious.
 

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It was night and for me when I switched over to the Bilstein HD 4600 shocks & struts and I only had around 72,000 miles on my Commander when I had them installed.

I also replaced the rear coil springs with new factory OEM rear coils.

Alot of people told me I probably didn't need to, but, I just wanted to drop a new set of springs in since I was having the shocks replaced anyway.

Yeah throwing a new set of springs in there when you already had it pulled apart makes sense. Not something I'd consider necessary, but if you are paying for labor then its not much of an increased expense.

I'd have gone for the hemi tow package springs or something for a slightly increased spring rate considering you have that nice roof basket. I'll getting one soon too. I like to fill my rig full of kids and belongings so the higher spring rate of the ROR springs (~between OME MD and OME HD AFAIK) comes in handy for me.
 

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Yeah throwing a new set of springs in there when you already had it pulled apart makes sense. Not something I'd consider necessary, but if you are paying for labor then its not much of an increased expense.

I'd have gone for the hemi tow package springs or something for a slightly increased spring rate considering you have that nice roof basket. I'll getting one soon too. I like to fill my rig full of kids and belongings so the higher spring rate of the ROR springs (~between OME MD and OME HD AFAIK) comes in handy for me.
Funny that you say that lucky, because it actually was the Hemi-rated rear coil springs that I had installed.

These are the ones I had had put in:

06-08 XK Rear Springs – Mopar #52124213AA_52124214AA #52124213AA_52124214AA

Replace worn, damaged or original rear springs on your Jeep Commander with new Mopar XK Commander rear springs from JustforJeeps.com. These springs, item #52124213AA_52124214AA, are made for use on 2006 - 2008 XK Commander Limited model trucks with a Hemi. Note that when you select this part, you are purchasing OE rear coil springs as a pair with the left rear spring being item #52124214AA and the right rear spring being item #52124213AA.
Now all that being said, my Rola roof basket is actually really light. I'd guess it only weighs 15-20 lbs because the steel tubing is hollow, so, it doesn't weigh very much, despite how it may appear.
 

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Funny that you say that lucky, because it actually was the Hemi-rated rear coil springs that I had installed.

These are the ones I had had put in:

06-08 XK Rear Springs – Mopar #52124213AA_52124214AA #52124213AA_52124214AA



Now all that being said, my Rola roof basket is actually really light. I'd guess it only weighs 15-20 lbs because the steel tubing is hollow, so, it doesn't weigh very much, despite how it may appear.
Oh nice! then yeah you were totally justified in having new springs installed.

I can see how the basket would be light, but I'd imagine that you occasionally use it and might put some relatively heavy stuff up there. Particularly when the vehicle is already full.

I don't load my roof rack up often so whatever I get will only be installed temporarily.

I already have a Thule or something hardsided roof top cargo box that I throw up on top of my vehicles occasionally.
 
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