Jeep Commander Forum banner
21 - 40 of 42 Posts

·
Registered
Joined
·
56 Posts
Wonder if one could fix an existing bushing with this diy kit from energy?
https://www.energysuspensionparts.com/diymmi
Too funny drm4633. I was reading old posts from our wk1 srt8 friends that have real issues with their diff bushings due to high hp. Before there were aftermarket companies making bushings with propriatary urethane durometer harnesses, the wk racing guys were using windshield urethane to stiffen the factory mounts. Same concept as what you have discovered with energys kit. It looks like a possible solution! I think its best to do with a fresh oem bushing before install.

Truth be told, the new creative steel bushing I had installed is too stiff for my taste. It allows for some gear whine noise at highway speeds. Not as bad as the jeep perf bushing, but not OE quality in regard to noise / vibration (nvh) transfer. The mopar engineers knew what they were doing putting rubber in there, but could have made a slightly stronger unit.

I think the idea of modding a factory bushing with urethane and playing with durometer and amount of fill is a pretty capital idea.
 

·
Registered
Joined
·
471 Posts
I'll have to check out wk racing...didn't know that existed. I might try it. Not sure how much work it is to flip the diff around...
 

·
Registered
Joined
·
86 Posts
Here are a few pictures of the black bushing from Creative Steel, next to one of the Dorman bushings from Rock Auto.

Note the large air gap in the stock style bushing, there is simply much less material there to absorb the energy. The bushing from Creative Steel, although much more expensive, appears to be far superior to the stock style. The bushing material encases the center steel part completely, and is notably heavier than the stock style bushing. There is a note on the side of the CS bushing regarding the installation orientation, so like the stock bushing, the orientation of the bushing does matter during installation.

I chose to follow the recommendation on the CS website and will be installing their black bushing in the pinion location, and the stock style bushings in the other location. I'll report back when I've found the time to install them.
 

Attachments

·
Registered
Joined
·
56 Posts
This is exactly what I did. Pinion bushing with their nice bushing and left the other two stock (oe bushings were 6 months old btw)

If you dont hear gear whine @ 50 mph to about 75 mph (on the gas) I'll be a monkeys uncle.

You will also feel NVH off the line in your foot and hear the NVH as that urethane bushing absorbs very little.

I have tried two aftermarket solid urethane bushings and they transmit too much NVH for my tastes.

Let us know how you make out.
 

·
Registered
Joined
·
86 Posts
This is exactly what I did. Pinion bushing with their nice bushing and left the other two stock (oe bushings were 6 months old btw)

If you dont hear gear whine @ 50 mph to about 75 mph (on the gas) I'll be a monkeys uncle.

You will also feel NVH off the line in your foot and hear the NVH as that urethane bushing absorbs very little.

I have tried two aftermarket solid urethane bushings and they transmit too much NVH for my tastes.

Let us know how you make out.
I can live with a little NVH. My front differential is flopping around in there quite a bit at the moment. This isn't a job I want to do again... like ever! I'll take the extra durability even if it comes at the cost of increased noise.
 

·
Registered
Joined
·
471 Posts
This is exactly what I did. Pinion bushing with their nice bushing and left the other two stock (oe bushings were 6 months old btw)

If you dont hear gear whine @ 50 mph to about 75 mph (on the gas) I'll be a monkeys uncle.

You will also feel NVH off the line in your foot and hear the NVH as that urethane bushing absorbs very little.

I have tried two aftermarket solid urethane bushings and they transmit too much NVH for my tastes.

Let us know how you make out.
So you have gear whine now or the bushings cured your gear whine?
 

·
Registered
Joined
·
56 Posts
Hi, yes you Will hear gear whine in your commander or grand cherokee if you put a solid urethane bushing in the upper diff position. I have installed this one and the one from jeep perf first. Both transfer the gear noise at highway speeds from about 50 mph to 75 mph when on the gas. I'm pulling mine out and putting the oem mopar rubber back in. Unfortunately, this not avoidable due to location of bushing. The harmonics are going to be noticable. If it doesn't bother the user, then kudos. I drive a lot at can't tolerate it. I have lifted rubicon on 37s, and a heavily modified muscle car, so my DD needs to be quiet. That's just me however. To each their own.
 

·
Registered
Joined
·
471 Posts
Hi, yes you Will hear gear whine in your commander or grand cherokee if you put a solid urethane bushing in the upper diff position. I have installed this one and the one from jeep perf first. Both transfer the gear noise at highway speeds from about 50 mph to 75 mph when on the gas. I'm pulling mine out and putting the oem mopar rubber back in. Unfortunately, this not avoidable due to location of bushing. The harmonics are going to be noticable. If it doesn't bother the user, then kudos. I drive a lot at can't tolerate it. I have lifted rubicon on 37s, and a heavily modified muscle car, so my DD needs to be quiet. That's just me however. To each their own.

thanks, i have the same whine right now but haven't replaced the bushings yet. maybe worn bushings have the same symptom? i have checked other known items for the whine and all seams ok.
 

·
Administrator
Joined
·
8,162 Posts
Truth be told, the new creative steel bushing I had installed is too stiff for my taste. It allows for some gear whine noise at highway speeds. Not as bad as the jeep perf bushing, but not OE quality in regard to noise / vibration (nvh) transfer. The mopar engineers knew what they were doing putting rubber in there, but could have made a slightly stronger unit.

I think the idea of modding a factory bushing with urethane and playing with durometer and amount of fill is a pretty capital idea.
That's some useful feedback, thanks for sharing Commando.
 

·
Registered
Joined
·
471 Posts
Here are a few pictures of the black bushing from Creative Steel, next to one of the Dorman bushings from Rock Auto.

Note the large air gap in the stock style bushing, there is simply much less material there to absorb the energy. The bushing from Creative Steel, although much more expensive, appears to be far superior to the stock style. The bushing material encases the center steel part completely, and is notably heavier than the stock style bushing. There is a note on the side of the CS bushing regarding the installation orientation, so like the stock bushing, the orientation of the bushing does matter during installation.

I chose to follow the recommendation on the CS website and will be installing their black bushing in the pinion location, and the stock style bushings in the other location. I'll report back when I've found the time to install them.
@GTF did you install your bushings yet? how did it go? any tips for a fellow diy'er like size of balljoint press that worked?
 

·
Registered
Joined
·
86 Posts
@GTF did you install your bushings yet? how did it go? any tips for a fellow diy'er like size of balljoint press that worked?
Yes, I finished the job yesterday and hit a few snags along the way, but the clunk is cured and it's all back together.

First, I used the shortcut method of lowering and rotating the differential rather than removing it entirely. This method would probably be easy on a Commander with stock front suspension, however since I have the RC spacer lift, it was much more difficult. The problem is that the front suspension hangs much lower with a lift installed, consequently the angle of the CV axle is greater. As you lower the differential, the CV axle contacts the inner part of the control arm and prevents the differential from dropping far enough to clear the passenger side bushing mount bracket enough to actually rotate the differential. Without a lift installed, you should be able to drop the differential and rotate it pretty easily.

My solution to this problem was to jack up the passenger side suspension from the bottom of the control arm, however that wasn't enough. I considered disassembling the passenger side suspension but that seemed to be a lot of extra work that I wasn't anticipating. I ended up leaving everything together and just putting my spring compressors on the spring while it was still installed and compressing it while jacking it up. That got it up JUUUUST far enough to get the differential rotated out and back in place once the job was done. It's doable this way with a lift, but it certainly complicates the job.

I used the method that another poster recommended of using a sawzall and cutting the center of the bushing out, then cutting the side of the bushing. I cut it just enough to split it, then buzzed it out with my air hammer. Came out MUCH easier than the new one went in.

I ordered a ball joint press from amazon which although not perfect, was able to fit over the bushing and squeeze it. However, I did not anticipate how much force it would take to press it in this way. You would probably need a breaker bar and a LOT of force and a LOT of turns to do it this way. I just used one of the pieces in the kit that fit over the bushing, and beat it in with my BFH. Was able to do it without damaging the bushing, but it too was a LOT of work.

I replaced the upper and forward bushing. The passenger side bushing looked ok, so I left it alone since it was such a pain to do the pinion bushing.

The clunk is gone, but as expected the Creative Steel bushing has a little more NVH than stock, but that's ok and it's nothing unbearable or dramatic. Just a little more gear noise and such but barely noticeable and worth the added durability in my opinion.

So, not a terrible job but be ready for added difficulty if you have a lift installed.
 

·
Registered
Joined
·
471 Posts
thanks @GTF. I just did an OME HD lift so I guess Ill have the same problems as you :( Hopefully I can wiggle it around like you did. Ill get new sawzall blades ready!
 

·
Registered
Joined
·
86 Posts
thanks @GTF. I just did an OME HD lift so I guess Ill have the same problems as you <img src="http://www.jeepcommander.com/forums/images/smilies/frown.gif" border="0" alt="" title="Frown" class="inlineimg" /> Hopefully I can wiggle it around like you did. Ill get new sawzall blades ready!
I think the Rough Country lift is probably a bit higher than the OME springs. In fact I think the RC lift is TOO high in the front, probably closer to 4”. With that in mind, it may not be as much of an issue with the OME lift, but be ready to deal with that if you encounter it.

Take care not to cut into the diff case with the sawzall, longer blades are probably better than the shorties. Lastly, make sure you correctly orient the bushings when you install them.
 

·
Registered
Joined
·
86 Posts
Just to clarify, I had the front jacked up with the wheels off the ground, so the suspension was at full droop. If the front suspension was on the ground the CV axle probably would clear enough to rotate the diff, however you wouldn’t have much room to work under there. This is one job that would be a lot easier with a lift.
 

·
Super Moderator
2006 Commander Limited, 5.7 Hemi QD2
Joined
·
1,881 Posts
Just to clarify, I had the front jacked up with the wheels off the ground, so the suspension was at full droop. If the front suspension was on the ground the CV axle probably would clear enough to rotate the diff, however you wouldn’t have much room to work under there. This is one job that would be a lot easier with a lift.
Possibly use of car ramps would work better?
 

·
Registered
Joined
·
471 Posts
Just to clarify, I had the front jacked up with the wheels off the ground, so the suspension was at full droop. If the front suspension was on the ground the CV axle probably would clear enough to rotate the diff, however you wouldn’t have much room to work under there. This is one job that would be a lot easier with a lift.

i have a 4poster that will hopefully make it easier :) thanks for the info!
 
21 - 40 of 42 Posts
Top