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post #1 of 15 (permalink) Old 04-24-2018, 08:02 AM Thread Starter
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Transfer swap

I own a 2006 commander with a 3.7 v6. The vehicle came with a NV145 transfer case. I am looking to swap out the transfer case to a part time 4wd unit. What unit is a compatible swap?
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post #2 of 15 (permalink) Old 04-24-2018, 01:37 PM
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Originally Posted by Jeepnovice View Post
I own a 2006 commander with a 3.7 v6. The vehicle came with a NV145 transfer case. I am looking to swap out the transfer case to a part time 4wd unit. What unit is a compatible swap?
First off welcome to the forum @Jeepnovice;

The terminology you are using is somewhat confusing when you say part time 4WD unit and as far as I know, Commanders never came with a NV145 transfer case;

It sounds to me like you want to have the ability to drive around in 2WD and drop into 4WD when you need it and unfortunately, Jeep Commanders were not designed that way - the only way to drive a Commander around in 2WD, is if you have a 2WD model with no 4WD capability whatsoever.

If you have any version of a 4WD Commander, you are driving around in 4-HI all the time & there is now way around it that I know of, that's one of the reasons they're gas mileage is so crappy.

Quadra-Trac I Commanders (which is most likely what you have if you have the 4x4 badge on the rear hatch door) use the NV140 transfer case.

Quadra-Trac II & Quadra-Drive II 4WD systems both use the NV245 transfer case which is a 2 speed transfer case meaning you can switch between 4-HI and 4-LOW.

If you have a NV140 transfer case, you have QT-I full time 4WD which also has traction control and electronic stability control.

If you wanted to switch out to a (NV245) 2 speed transfer case which would be the QT-II or QD-II 4WD system, that would cost you literally thousands of dollars because you would also have to swap out your differentials and all the other related 4WD components.

Even if you swapped out to the NV245 transfer case with QT-II or QD-II, you would still be driving around in 4-HI all the time.

I can't think of - nor have I heard of any feasible part time 4WD solutions for a Commander.

Hope this helps you out.
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Last edited by Big Blue; 04-24-2018 at 01:50 PM.
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post #3 of 15 (permalink) Old 04-24-2018, 03:18 PM
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Join Date: Oct 2017
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sounds like a neat problem.

there are options out there for the 5speed 545rfe:
545rfe transmission x-fer case options? - Pirate4x4.Com : 4x4 and Off-Road Forum

Which trans do you have? W5A580? Maybe find out if jeep wranglers of same era had the your trans and engine combo and go from there...
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post #4 of 15 (permalink) Old 04-24-2018, 06:08 PM
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Quote:
Originally Posted by drm4633 View Post
sounds like a neat problem.

there are options out there for the 5speed 545rfe:
545rfe transmission x-fer case options? - Pirate4x4.Com : 4x4 and Off-Road Forum

Which trans do you have? W5A580? Maybe find out if jeep wranglers of same era had the your trans and engine combo and go from there...
The 3.7L engine does not come with the 545RFE Transmission, that transmission is only used for the 8 cylinder Commander power-trains, which is either the 4.7L or 5.7L V-8.

Commanders with 3.7L V6's & QT-I 4WD came with the 5-Speed Auto W5A580 Transmission; I believe it is also known as the NAG-1, seems I remember reading that somewhere before.


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Last edited by Big Blue; 07-12-2018 at 06:31 PM.
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post #5 of 15 (permalink) Old 04-24-2018, 11:56 PM Thread Starter
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Join Date: Apr 2018
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Current Mileage: 170,000
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My bad, it is an nv140. I was hoping that a transfer case from a grand cherokee or similar model would swap with minor modifications. Oh well, I guess I had better buy stock in oil wells. lol. Thank You for your assistance.
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post #6 of 15 (permalink) Old 04-25-2018, 07:42 AM
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Join Date: Oct 2015
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Originally Posted by Jeepnovice View Post
My bad, it is an nv140. I was hoping that a transfer case from a grand cherokee or similar model would swap with minor modifications. Oh well, I guess I had better buy stock in oil wells. lol. Thank You for your assistance.
Grand Cherokees of the same model years (2006-2010) use the same exact transfer cases & 4WD systems as Commanders, so you would still have the same exact problem unless you tried to use one out of an older Grand Cherokee maybe pre-2005.

As I have said on this forum many times, I'm no mechanic, so, I don't know if they are compatible - nor do I know if they could even be swapped without major modifications to the drive-train, transmission & other 4WD components.

I can tell you that I've never heard of it being done before.


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post #7 of 15 (permalink) Old 04-25-2018, 08:51 AM
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Join Date: Oct 2017
Location: Middle TN
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anything's possible...check with advance adapters or novak conversions for xfer case adapters.
i would start with jeep wranglers that use the nag1 and go from there.
post back on what you find...

Last edited by drm4633; 04-25-2018 at 09:17 AM.
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post #8 of 15 (permalink) Old 04-25-2018, 05:32 PM
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Join Date: Oct 2015
Location: East Coast of Florida; Proud to have served.
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 4.7L V-8
4WD
If 4WD - system: QT-II
Current Mileage: 101,200
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Quote:
Originally Posted by drm4633 View Post
anything's possible...check with advance adapters or novak conversions for xfer case adapters.
i would start with jeep wranglers that use the nag1 and go from there.
post back on what you find...
I'm not so convinced....seems to me if this was doable, it would have been done by someone else by now and I haven't heard of such a thing in the 3 years I've been here.


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post #9 of 15 (permalink) Old 04-25-2018, 07:30 PM
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If you should find a part-time unit that fits, you will likely need to adjust or install custom driveshafts to match, and then you will have a very unhappy computer.... you will get about four lights on the dash (no joke)..... you can turn off all the wheel sensors and traction/stability control components by removing a fuse or two....the lights stay on though.

Some guys that installed aftermarket lockers in the past put a switch on the traction control fuse(s) so that they could turn it off when they turned the locker on. This was for electronically but manually controlled lockers..... they would get the dash lights, but the system would function as expected. They were only using this in extreme off-road conditions so they were not dealing with the lights full time, or running the commander without traction and stability control on roads and highways.

You would be disabling traction and stability control for good.

I am not sure if this affects ABS as well... would recommend testing so you know in an emergency if ABS will engage or you will be skidding to a stop.

2010 5.7 QTII -
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post #10 of 15 (permalink) Old 04-26-2018, 12:30 PM
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Join Date: Oct 2017
Location: Middle TN
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Model year: 2007
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Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 130k
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definitely sounds like a lot of work...

i did some research that i would have never done without this thread. apparently the nag1 was used in the srt8 grands. i always thought the 545 was a stronger transmission since it was used in the ram trucks. but from reading about people running 11s twin turbo rams (lol), it looks that the nag can be built up to be stronger.

ram trucks had part time xfer cases too. after thance's reply, sounds like you would need to not only swap out xfer case but also computers and some electronics. that could get out of hand very quick!

thinking outside the box is part of how we evolve. just because no one here has done it, means there's opportunity lol.
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