3.7l V6 with QT2, NV245?

33345 Views 106 Replies 19 Participants Last post by 07JeepXK, Jun 21, 2011

Fstop28

Discussion Starter · Oct 13, 2009

Sometime back i posted a tread trying to figure out what transmission I have. Now I need to know about the transfer case. Do I have the NV245 or the NV140. I have the 3.7l V6 with QT2. I assume since I have QT2 i would also have the NV245...am i right? Manual doesn't help.

Also while we are talking about it I was wondering if there is anyone else on the forums with this set up? Robby (I believe) had mentioned it being somewhat rare. Anybody else have it?

41 - 60 of 107 Posts

cmdr jim

· #41 · Nov 5, 2010

Fstop28,
Thank you for your help, the module with #56044129AK is the Transfer Case.
The one with #50201606AC is the Parking Assist Module. It's hard to see the plug for the Transfer Case Module, but comparing it to my QT1 wiring harness I would say we who have QT1's don't have the right wiring harness to add in QT2.

Fstop28

Discussion Starter · #42 · Nov 6, 2010

cmdr jim said:
Fstop28,
I would say we who have QT1's don't have the right wiring harness to add in QT2.

How involved is this wiring harness? Do the V8's use the same harness? How difficult would it be to swap one out? I mean...if your going to the trouble of swapping everything else involved... why not swap the harness too?

cmdr jim

· #43 · Nov 7, 2010

Fstop28 said:
How involved is this wiring harness? Do the V8's use the same harness? How difficult would it be to swap one out? I mean...if your going to the trouble of swapping everything else involved... why not swap the harness too?

I don't think it would be too difficult to do. Beemer9 changed his harness with going from a QT2 to a QD2. He had to get Chrysler add the option to his VIN number and his dealer to program it.
Biggest problem is figuring out all the 3 letter codes that represent vehicle options to be able to order the right underbody harness.

Beemer9

· #44 · Nov 7, 2010

If you guys are serious about doing a swap like this, do a google search for 06xk.pdf (or whatever year yours is). This gives you a Genuine Jeep parts manual.
That really helps trying to figure out what parts are needed.
As far as option codes, go to your Jeep dealer parts department. They should be able to print out an "as built" configuration for your vehicle that shows the option codes it has. They'll need your vin. If they can't do it, try another dealer.
If your trying to figure out a weird option code, search google for it, like "06 jeep commander XAA".

cmdr jim

· #45 · Nov 8, 2010

Beemer9 said:
If you guys are serious about doing a swap like this, do a google search for 06xk.pdf (or whatever year yours is). This gives you a Genuine Jeep parts manual.
That really helps trying to figure out what parts are needed.
As far as option codes, go to your Jeep dealer parts department. They should be able to print out an "as built" configuration for your vehicle that shows the option codes it has. They'll need your vin. If they can't do it, try another dealer.
If your trying to figure out a weird option code, search google for it, like "06 jeep commander XAA".

Beemer9,
Thank you for signing in on this. If one of us goes forward with swapping out the underbody wiring harness, I'm sure you will be able to give us some good insight.
One question I do have for you. When you changed yours, did the underbody wiring harness include the wires running to the modules under the rear seat on the driver's side? These being the Transfer Case Module and the Parking Assist Module.
The next question, which wouldn't have affected your swap, but maybe someone else would know the answer. Does the V6 QT1 have the transfer case switch wiring under the shift console? This could be the real show stopper. It would require a major wiring harness change out if it's not there.

Beemer9

· #46 · Nov 9, 2010

cmdr jim said:
Beemer9,
One question I do have for you. When you changed yours, did the underbody wiring harness include the wires running to the modules under the rear seat on the driver's side? These being the Transfer Case Module and the Parking Assist Module.
The next question, which wouldn't have affected your swap, but maybe someone else would know the answer. Does the V6 QT1 have the transfer case switch wiring under the shift console? This could be the real show stopper. It would require a major wiring harness change out if it's not there.

1. Yes, the connectors for the modules under the 2nd seat are in the underbody wiring harness and come into the cabin thru about a 3" hole with a rubber seal.
2. Don't know, I would assume it would be in the same place as the V8 QTII. Check the parts manual that should show it.

cmdr jim

· #47 · Nov 9, 2010

Beemer9 said:
1. Yes, the connectors for the modules under the 2nd seat are in the underbody wiring harness and come into the cabin thru about a 3" hole with a rubber seal.
2. Don't know, I would assume it would be in the same place as the V8 QTII. Check the parts manual that should show it.

Beemer9, thank you for the help. It looks like for my Commander I would need the one for XAA, DHX underbody wiring harness. XAA = Park Assist System
DHX = NV245 Transfer Case. That should be part number 56050676AD for the harness.
I think I will need to take the console apart to find out if I have the transfer case switch wiring inside.

cmdr jim

· #48 · Nov 19, 2010

cmdr jim said:
I think I will need to take the console apart to find out if I have the transfer case switch wiring inside.

Took the bezels off around the shifter, last night. Guess what? My 3.7L QT1
has the wiring and connector ready for the transfer case switch. And looking at where the transfer case switch goes, I don't think it would take much to modify the bezel to mount it. Probably similar in difficultly as adding steering wheel radio controls.

Check off one more item off the list.

cmdr jim

· #49 · Nov 22, 2010

After more research, to complete the transfer case switch in the console. Here are a couple other options, rather than modifying your shifter to mount the transfer case switch:

1. Replace the shifter bezel, #68004144AE Shifter Bezel 3.7L w/ QT2 PRNDL Bezel [DHX] and a #56050139AF Transfer Case Switch

2. Replace the complete shift #52124002AE Complete Shifter 3.7L w/ QT2 & PRNDL Bezel (I think this comes with the transfer case switch, but it would be best to confirm)

I did find a new #52124002AG Complete shifter on ebay, which shows the transfer case switch if anyone is looking.

http://cgi.ebay.com/ebaymotors/jeep-commander-shifter-assm-52124002ag-new-oem-/290476129038?pt=Motors_Car_Truck_Parts_Accessories&hash=item43a1b9fb0e#ht_500wt_826

cmdr jim

· #50 · Dec 13, 2010

Transfer Case Part Number needed #52853391AB or 52853391AC.
New from an online Mopar parts dealer around $1,200.

If you can find a low mileage used one, $400 to $750 is what I see on
http://www.car-part.com/
Personally I have 45,000 miles on mine. So I would be going for one below that mileage.

One thing to be sure of, it has to have come from a Jeep Commander or Grand Cherokee, with the 3.7L V6 engine and QT2 (NV245) the V8 NV245 will not bolt up to the V6 transmission.

Next question, driveshafts, they can be of either V6 or V8 QT2 (NV245) equipped Commanders, but are they rebuild-able (replaceable U-joints)?
If not than new would be better then used.

Mongo

· #51 · Dec 13, 2010

cmdr jim said:
One thing to be sure of, it has to have come from a Jeep Commander or Grand Cherokee, with the 3.7L V6 engine and QT2 (NV245) the V8 NV245 will not bolt up to the V6 transmission.

I would have to look at the part catalog again to know for sure, BUT, I "thought" the transfer case had an adapter collar between it and the transmission. So, wouldn't any NV245 work, as long as you got the right adapter collar?

Have you looked up prices for the parts from online dealers? Or have you found a junked donor car to strip the parts from? I imagine the biggest obstacle is going to be the mark-up on all the parts you'll need if your going to dealerships to get them, it will get really expensive, very quickly.

cmdr jim

· #52 · Dec 13, 2010

Mongo said:
I would have to look at the part catalog again to know for sure, BUT, I "thought" the transfer case had an adapter collar between it and the transmission. So, wouldn't any NV245 work, as long as you got the right adapter collar?

Have you looked up prices for the parts from online dealers? Or have you found a junked donor car to strip the parts from? I imagine the biggest obstacle is going to be the mark-up on all the parts you'll need if your going to dealerships to get them, it will get really expensive, very quickly.

Yes, I've looked at the parts manual and I also had a Jeep dealer work with me on the the build sheets of a 3.7l with QT2 (nv245). Basically, I gave him the last 9 digits of a known 3.7L V6 QT2 Jeep Commander and he looked up the build sheets for the transfer case, electrical modules, wiring harness and shifter.

The 3.7L with the QT2 NV245 transfer case is a very rare combination. It's the input shaft and a planetary gear set inside that is different than the V8s. Look at the parts manual and it's there.

The $1200 is an online Mopar parts website price new. Not sure if that includes the transfer case shift motor. I'm thinking used low mileage is the way to go, if you can find one.

Can anyone confirm if the driveshafts are rebuildable?

07JeepXK

· #53 · Dec 14, 2010

The drive shafts are not rebuildable. You would need to get either a brand new drive shaft or one from a junk yard that has good u-joints.

Mongo

· #54 · Dec 14, 2010

cmdr jim said:
The 3.7L with the QT2 NV245 transfer case is a very rare combination. It's the input shaft and a planetary gear set inside that is different than the V8s. Look at the parts manual and it's there.

That makes sense to me, and now that I think about, a couple of years ago, when I fixed up an old 4X2 "XJ" for my daughter to drive, I looked into the practicallity of converting it to 4X4. Now I remember finding what you described, basically different version of each transmission and transfer case for each combination, and it varied with the input/output shafts that would mate for the different combinations and even modified cases to make up for the difference in distances between input/output shafts.

Common sense would lead you too believe they would make the Trans/XFR Cases more modular and easier to mate up in different combinations. BUT, I'm guessing that would require compromising the designs to make them smoother, more quite, reliable and longer lasting. I guess they have to custom engineer every combination of trans and transfer case to have them perform the way most people expect.

07JeepXK said:
The drive shafts are not rebuildable. You would need to get either a brand new drive shaft or one from a junk yard that has good u-joints.

Just out of curousity, why are they NOT rebuildable? I can see how the telescoping part of the driveshaft is NOT, I can't imagine how you would rebuild splines, but "U" joints? Are the end cups somehow joined into the driveshaft lugs in a way they are NOT removable without breaking the driveshaft? As well, CV joints are usually rebuidable to a degree, but of course if you can NOT get the parts, then its a moot point anyway.

See less See more

robby

· #55 · Dec 15, 2010

Mongo,
There currently is no source for replacement u'joints.
The driveshaft assemblys were sourced from Mercedes and apparently in Germany they chose not to recondition.

One would think there could be a aftermarket substitute.....but not yet.

Rob

Mongo

· #56 · Dec 15, 2010

Is this all the driveshafts? I count 4 driveshafts for a 4x4.
*Front 2 are typical CV shafts, no one has started to offer rebuilt versions?
*The Front Driveshaft from the Transfer case to the front Differential, look like a hybrid CV joint and universal Joint.
*The Rear Driveshaft is like none I have seen on a Domestic Vehicle before, definitely willing to believe that is from Mercedes.

Best I can tell, the rear driveshaft is aluminum and telescopes with fix yokes, and there is a special coating over the splines no less. Unless there is some sort of inner/outer sleeves that you can easily remove and replace, I don't see how you can rebuild the axle? The splines wear down, there are only a few things you can do to raise the metal surface a few thousands of an inch, but after that, its NOT good.

So, if I understand you correctly, I can disassemble the U-Joints like normal, I just can't get new ones to replace worn out U-Joints, and the typical domestic offerings will NOT fit.

robby

· #57 · Dec 16, 2010

Mongo,
The front halfshafts are rebuildable and remans are available as well.
Yes, I am saying there currently are no driveshaft U-joints available and yes, you can take them apart.......only to find there is no joint listed.

This, and things like replacing lower control arms because there are no available bushings makes me nuts.

The concept of pitching sub assemblys due to lack of service parts is not just a Jeep thing......I am finding more and more of this 'waste' in newer vehicles......like they took a page out of computer repair.....just throw the whole thing out....arrrg!!! sheesh!!

Rob

cmdr jim

· #58 · Dec 16, 2010

robby said:
Mongo,
The front halfshafts are rebuildable and remans are available as well.
Yes, I am saying there currently are no driveshaft U-joints available and yes, you can take them apart.......only to find there is no joint listed.

This, and things like replacing lower control arms because there are no available bushings makes me nuts.

The concept of pitching sub assemblys due to lack of service parts is not just a Jeep thing......I am finding more and more of this 'waste' in newer vehicles......like they took a page out of computer repair.....just throw the whole thing out....arrrg!!! sheesh!!

Rob

Blame our throwaway society and corporate greed. Why sell you a couple $25 parts when I can sell you the whole thing for $250!

robby

· #59 · Dec 16, 2010

I got caught up in the media thing I guess......you know, reduce waste, etcetera.

Sigh,
Rob

Mongo

· #60 · Dec 16, 2010

It may be more a symptom of the lack of DIY and shade tree mechanic, everyone goes to dealers and big chain repair shops now. The high cost of labor makes it cheaper and more efficient to replace sub-assemblies than pay the high labor rate of pressing bushings and ball joints in and out, to re-use the control arm.

My pet peeve is the Dealer Scan Tools. There is NO reason why I can't hook up my laptop to my vehicle and do all the things I'm capable of doing myself for $100 worth of cables and software. BUT, the manufacturers keep that stuff proprietary, and there is just NOT a big enough market for anyone to develop a 3rd party tool that is reasonably priced for the DIY'er.

To many people just take their vehicle to the Dealer and pay $500 in labor and NOT think twice about it. It creates a situation that the few left that do it themselves, and try to save money, really aren't a big enough market to lift a finger for them.

41 - 60 of 107 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.