mp1522 swap to mp3022?

sgsmith · **Posted:** Fri Aug 19, 2011 1:11 am

Just kind of curious if a swap from an mp1522 to a mp3022 was possible or even worth it? I can't say I have a real interest in actually performing the swap. Still kind of confused by the two sides on this, where command-trac gets some praise and not and the selec-trac seems more like the soccer mom AWD setup. Figured I'd ask.

edit -- Is there also perhaps a better suited transfer case that could be swapped in?

JeepinJarhead03 · **Posted:** Fri Aug 19, 2011 1:24 am

this might answer some of your questions

viewtopic.php?f=88&t=25830

the command trac is more suited to off-road 4x4 use , select trac II is an improved? version of select trac which is more so AWD than it is 4x4 as 4x4 is typically understood

their drawback / advantage mostly centers around their ROAD manners the command trac can bind up on a high traction surface which is damaging to the drive line whereas you can drive the select trac on dry pavement

the command trac is a part-time (for use "part of the time") where the select trac is a full-time (able to be used in 4wd auto "full time" on a road without regard to the traction of the surface

both models 4Lo are offroad only

sgsmith · **Posted:** Fri Aug 19, 2011 1:44 am

Good deal. I'm still completely green when it comes to off-roading. But if I'm reading everything correct, then for my wants, (To get serious into off-roading my liberty) that I made the right choice by not going with the selec-trac?

JeepinJarhead03 · **Posted:** Fri Aug 19, 2011 1:49 am

correct

not that the select trac can't do well, the command trac by it's nature will surpass it in certain situations off road but cannot be used on high traction surfaces such as a dry road

that's the draw back, which for some, is a big deal

thus the ping pong argument of which is better, it's a all a matter of what you need/want from the system

sgsmith · **Posted:** Fri Aug 19, 2011 1:51 am

Awesome, thanks man.

jonrjen · **Joined:** Thu Jun 30, 2011 9:53 pm **Posts:** 60

Here are a couple of links showing the Select Trac II engaged and showing how the wheels will either spin slightly or stop rotation as the systems is gauging and tranfering traction as needed.

http://www.youtube.com/watch?v=Y37MbouVJ4c&NR=1
http://www.youtube.com/watch?v=iJTvDDMKkqo&NR=1

I searched multi state dealer inventories looking for the Select Trac II, because I felt it was the better all around system for practical day to day use under all conditions. As for off road use, I still think it offers more out of the box ability than a Command Trac. Granted you could install lockers in the diffs, however there are other limitations to the Libertys off road capability other than traction. Such as ground clearance, bumper overhang, and the cost of off road parts when compared to the cost of like parts for a Wrangler.
And for those rare, but seem to be happening much more often "Texas Snow Events" the Select Trac II offers the ability to drive on slick snow covered roads, where the Command Trac will tend to push straight forward when engaged...

sgsmith · **Posted:** Fri Aug 19, 2011 10:52 am

Thanks for the info man. I definitely get ya on the capabilities. Though I'm not terribly concerned about the clearance and overhang as I have plans for a lift and front/read bumper replacement. As for our texas snow events, hehe, I think I can handle that one to 6 days of snow ice we seem to be getting each year now with the two wheel drive

So outside of that though, just for my own curiosity, is a transfer case swap possible, feasible or even something I should ever think about? Not just swapping to the mp3022 but to any other transfer case in general?

jonrjen · **Joined:** Thu Jun 30, 2011 9:53 pm **Posts:** 60

I don't know what all would be involved with doing the swap. I know most anything can be done with enough money, but at some point there is usually another way to accomplish what you are looking to do.
I know if we were talking Wranglers the easy simple answer would be gear swap and installation of lockers. Either one or both, depending on how serious you want to get with your off roading. I don't know what locker options are available for the Liberty at this time.
Also havent' seen to many choices for aftermarket bumper options for the KK Liberty. A lot of speculation, talk and one off hybrids, but not much if any in production.
I do know a guy over in Tyler that maybe willing to fab up any ideas you have. He does some pretty nice work. There is also someone over in NRH that is pretty good at fab work also. You may want to pay a visit over to the Lone Star Jeep Club website, not much on the Liberty, but a wealth of great information on Jeeps, meeting, outings, get togethers and a pretty good bond of brother-hood.
Not sure how much of the white stuff you'll got over in Cowtown, but here in Ovilla and Midlothian we got a little more than 16" on that last big'un.

sgsmith · **Posted:** Fri Aug 19, 2011 5:08 pm

Hehe, yeah, I think last year we actually got a bit for one day, but was almost completely gone the next day. I'll definitely look into the Lone Star Jeep Club. At the moment, no serious plans for the swap or upgrades to it. Just was curious if these were things that were standard fair. As for the bumpers, I've definitely noticed the lack of aftermarket and intend on going the fabrication route.. or with luck, MtnLuvr will be able to start taking orders some day for his design. Been heavily reading every post I can find on what he's been doing.

JeepinJarhead03 · **Posted:** Fri Aug 19, 2011 6:33 pm

here's the if's for the most part

if the transfer case has electronics aside from position indicator / electronic actuator then wiring has to be switched over and PCM updated to reflect the different transfer case - not sure how much electronic activity is going on sensor wise in this generation of transfercase, prior generations typically just required disconnecting linkage, 2 driveshafts and unbolting it dropping it and repeating the procedure in reverse with few exceptions to switch between the CT and ST - with advent of traction control etc transfercases are on a path to becoming more like a second electronic transmission than a mechanical transfercase - but by simple part number lookups you can / for the most part / determine the changeover compatibilities between the two in question

look up the part numbers for the driveshafts for an 08 , if theres 2 different pn's depending on the transfercase then you have another part of your answer

chances are the input gears/splines are identical - and more than likely the driveshaft lengths are identical and most likely the mounts are identical as well

to be cost effective between models they typically have always had a high level of compatibility between sister components

sgsmith · **Posted:** Tue Aug 23, 2011 10:42 pm

Thanks jeepin, I have done more reading and am still completely up in the air on the command-trac vs selec-trac. But after reading your suggestions and doing a lot of parts lookups, it seems doable, albeit an expensive upgrade. But, in looking up all this, I've definitely learned way more than I knew before about how full time and part time four wheel drives work.

mp1522 swap to mp3022?

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