Good evening,

My KK has command trac (MP1522 transfer case). A friend has a select trac MP3022 transfer case from a totalled 2009 KK for sale for cheap. Mine is a 2012. I was wondering if swapping it and changing my interior selector switch would provide me with the permanent 4WD option.

I googled the subject and found a lot of info on old Cherokee's and Wrangler's, but that was prior to fancy computers replacing everything in a vehicle.

Besides switch, t-case and shifter linkage (?), what do i need? Would it even work?

I know folks, i could have purchased a KK with select trac, but at the time i did not live in a cold climate and this opportunity to swap will cost me less than $400, so i might as well.

Any insights are appreciated.

Best,
Oban

_________________
2012 Jeep Liberty KK, 4x4, Mopar Hitch, Hood Lift Strut Mod, OME Lift, Bilstein Shocks, 245/75R16 AT3's

It will need a computer reprogramming at the very least but I suspect there is probably a lot more involved. Pretty sure it's all electronic so no linkage but I could be wrong. Not sure anyone has done it here.

_________________
08 KK OEM skid plates, JK winch bumper w/ Hella 500s, K&N filter, JKS front discos, black out headlights w/ fogs added, blacked out & euro mod tail lights, Curt Hitch w/ oem wiring, OME Springs, JBA UCA & top plates, Cabin Filter Retro Fit, Custom Fender Mounted Light Mounts w/ Hella 500s, ATH roof bars, rear flush mount LEDs

Yep you will need the electronics to deal with and you will most likely need both driveshafts also.

In other words, i will need a StarScan / WiTech to get it done? Or would the stealership computer not be able to do it?

And that said, even if the dealer can do it, what are my chances that a technician at the stealership actually knows what he needs to do? (I guess, chances are slim)

Thoughts?

_________________
2012 Jeep Liberty KK, 4x4, Mopar Hitch, Hood Lift Strut Mod, OME Lift, Bilstein Shocks, 245/75R16 AT3's

Guys,

Let me ask you this: if i would install a limited slip diff (Tru Trac or similar) on the front axle, would that enable me to use Command Trac in 4HI constantly?

The limited slip diff should compensate for varying wheel speeds left or right without putting stress on the transfer case, right?

If this is doable i would probably want to go this route. Any input? I have little experience with diffs.

_________________
2012 Jeep Liberty KK, 4x4, Mopar Hitch, Hood Lift Strut Mod, OME Lift, Bilstein Shocks, 245/75R16 AT3's

Won't work. You already have an open diff up front(and in back). All a limited slip does is limit the difference in "slip" between the driver side and passenger side tires on 1 axle. So if the drivers side tire spins, the limited slip will engage helping to send power to the passenger side tire.

With command trac the front and rear axles are locked together. Select trac uses clutches(I think) to allow for slip between the front and rear axles.

_________________
2011 Deep Cherry Red KK - Skyslider - JBA/Bilstein Adjust-A-Strut set at 3.5" - OME 731 Rear Springs - Bilstein Rear Shocks - Al's A-arms - 245/75-16 Duratracs - Rock Liazard Super Sliders

I am talking about replacing the open front diff with a limited slip diff. Wouldn't this compensate for the lack of a diff in the t-case? All i need is to compensate for one wheel turning faster than the other, like during curves and turns, right?

Or could i add slip to the transfer case without the whole computer trickery needed compared to switching all parts over to Select Trac?

_________________
2012 Jeep Liberty KK, 4x4, Mopar Hitch, Hood Lift Strut Mod, OME Lift, Bilstein Shocks, 245/75R16 AT3's

One part of the problem is that when you run different axles the gears aren't exactly the same. The small difference doesn't matter off road because of slip, but with a lot of traction that eventually adds up.

Also the axles take slightly different paths when turning so there will be slight differences in speed(check this link to see what I mean, it's just a random site on google that explains it: http://www.4x4abc.com/4WD101/def_turnpart.html ).

As for converting the transfer case, I honestly would not know. Troy might know that. All I know is the command trac case is chain driven allowing no slip, and select trac has clutches or some type of coupler that allows slip.

_________________
2011 Deep Cherry Red KK - Skyslider - JBA/Bilstein Adjust-A-Strut set at 3.5" - OME 731 Rear Springs - Bilstein Rear Shocks - Al's A-arms - 245/75-16 Duratracs - Rock Liazard Super Sliders

It looks possible in theory, however you would probably need to change the driveshafts and definitely need to rewire the transmission harness because the connectors on the t case are completely different. The tipm would also need to be reprogrammed, although I'm not sure if the dealer would be able to do that.

_________________
2008 Liberty Sport
OME Lift, JBA A-Arms + Track Bar
245/75/16 Nokian Rotiiva AT Plus
Numerous junkyard upgrades

I was going to look up part numbers today to see what is different. That said, it almost appears that getting a used TIPM from a Select Trac vehicle would be the best bet?

I am still wondering if there is some possible modification to the hardware to allow for slip. I don't care if I would have an additional button or lever... Not a fan of the TIPM anyway.

_________________
2012 Jeep Liberty KK, 4x4, Mopar Hitch, Hood Lift Strut Mod, OME Lift, Bilstein Shocks, 245/75R16 AT3's

As far as the part numbers go, the only parts I see that are different are the shift switch, rear driveshaft, and engine harness. Assuming you get the driveshaft and switch with the T-Case, you can wire in the two extra circuits yourself. It looks like the needed wiring already exists in the IP and body harness, so you can tap into them at the large black/gray connector on the drivers side firewall. From there you would have to route the wires down to the T-case and re-pin the existing connector into the two connectors for the select-trac. The TIPM for sure can be reprogrammed with the new T-Case type, however the dealer scantool might not be able to do it. Swapping a TIPM is not a good idea, because each one is programmed specifically to that jeep as it came off the line, so it would need to be reset anyways.

I can't think of anything off the shelf for a hardware solution. The easiest way I could think of would be to have an overrunning clutch on the front driveshaft.

_________________
2008 Liberty Sport
OME Lift, JBA A-Arms + Track Bar
245/75/16 Nokian Rotiiva AT Plus
Numerous junkyard upgrades

Easiest and cheapest route is to sell current KK and buy KK with what you want.Not that the programming can't be done just no tech(or dealer) will do it period.It will cost you the cost of a Starscan and the cost of buying the correct programs from Chrysler(upwards of $600-$1000 for the program) but 1st you'd have to switch the VIN as the programs are VIN specific then your getting into major legal issues.


Adding a LSD in a diff will not do what you want it to do.

tjkj2002 Totally nailed it!
Dealer won't do it, and Jeep will not update the VIN so you can have it done.
Shoot, they would not even update my VIN to add a OEM Amp and Sub.

_________________
07 KA Light Khaki, Manual trany.
2.5" Adjust-A-Strut JBA lift, Euro taillights,
Home made; Front Tilt Hood, Roof Rack, RAM Air, & CAI.
ESP Off Switch
Take a ride on the Trō side!

Put a trutrac in the rear and forget about it. That and good tires will get you through anything you don't need 4WD for. I've got them in both axles, big plus for traction. Plus, the traction control hardly engages.

_________________
2010 KK Deep Water Blue,OME Liftplus 1",JBA 5.5 UCA ,Dynaflow cat back exhaust, Weathertech VV & mats,Mopar skids,Atthehelm front bumper, Smittybilt XRC 10, Rigid LED's,RL Skink Supersliders,Gecko Safari Basket Detroit Truetrac rear, E-Locker front, G2, Dana 4.10's