3.7L V6 QT1 to QT2 Conversion.

[cmdr jim]

I hope to have the wring completed this weekend. I plan on putting the transfer-case in the back of the XK and just wiring it in before actually swapping in it. I can then check out my wiring and programming before the actual install. Installation is planned the weekend of the 19th if all goes well.
Keep in mind, I'm working on this slowly, a couple hours here a couple there.

[cmdr jim]

Another step closer. Under the rear seats of the Commander there are to small areas covered by a carpeted lid. On the driver side is were the FDCM and Parking Control Module would go. On the passenger side, mine is empty and it provides a perfect place to mount the relays and voltage regulators. Next step is to ground the panel, provide power and final connecting of the wires to the controller under the dash.

[1USMC]

cmdr jim ...

Wow.. the transmission work you are doing is way over my head, but if it is anything like your wiring job it should turn turn out great. I tinker as an amateur with my own wiring. I can appreciate all the time you put in and the professional wiring work you do. Keep up the good work..

[cmdr jim]

If you all remember way back, I was lulled into the idea a Jeep dealer or Jeep itself could upgrade my QT1 to QT2. I was collecting all the parts to do so. even to the point of swapping out the mid underframe wiring harness.
Of course the Jeep Dealer or Jeep didn't happen. And that why I'm here.
Moving forward. with that new wiring harness, there are connections under my rear seat for the FDCM and under the Jeep the connection for the Transfercase Motor. Yes you guessed it, I spliced into the wiring harness under my rear seat. This gives me all connections inside the jeep.
However, if someone else were to do this, there is a large grommet under that same area under the rear seat, wires can be brought up through that grommet and sealed. You could find a junk yard WK or XK with QT2 or QD2 and get the Transfercase motor connection from one of them. Or worst case buy a repair splice-in connector from Jeep. Part Number #68040504AA

[cmdr jim]

I have the transfercase in my Jeep!

Well, technically it's in the Jeep, in the back cargo area
But it's all hooked up electrically and functioning just like it did when I was bench testing.
So that means the electronics wired into the Jeep work!

[07JeepXK]

Nice... get that thing bolted in under the XK now!

[cmdr jim]

The has been a long time in the making with lot's of side tracks, here is hoping the install goes smoothly tomorrow and I don't find low lock with "limp mode"
Here are the part numbers for the Front Driveshaft (P52105728AD), Rear Driveshaft (P52105760AE) and Transfercase (P52853391AB).
Note the driveshafts can come out of any Jeep WK or XK as long as it had a NV245 (QT2 or QD2) Transfercase.
However the Transfercase has to be for a 3.7L V6 QT2 equipped WK or XK only.
See the last picture, this is what the input side of the transfercase needs to look line.

[Sal-XK]

Good luck man!

[07JeepXK]

Let us know bro!

[cmdr jim]

It's all in, a fairly easy job. It took me 6 hours, but messing with the passenger side nuts added extra time. Removing the transmission crossmember and lowering the transmission helps, but a 13mm crows-foot makes it happen, I only had a 1/2" but it's interchangeable. The fuel tank skid plate added to the difficulty as well. I had to remove the transfercase motor from the transfercase and bend a corner of the fuel tank skid plate to get the transfercase up past it. I simply bent the corner back afterwards. An adjustable wrench works well for this.
Attached are pictures of the end of the nag transmission, the NV245 and NV140 transfercase and finally a picture comparing the NV245 drivetrain to the NV140 drivetrain. The NV140 is about half the weight of the NV245.
I have tested shifting the transfercase and the transfercase is shifting correctly, next is to test drive it, check for vibrations with the used driveshafts and to test for low lock errors.