jeep comanche running gear question

[buddy208]

will a grand cherokee running gear (axles,engine,tranny) fit in my 89 comanche if i get a different wiring harness from a normal cherokee.

[Geonovast]

That's a very, very broad question.

 

What year Grand Cherokee? What year XJ? What, specifically, are your plans?

[buddy208]

i have a 89 comanche that i want to swap motors from a 4clyinder to a 6cylinder and the axles, and i want to take the engine and axles from a 95 grand cherokee.

[Geonovast]

The engine can be made to work with the ZJ harness, although it's not going to be easy.

 

The front axle will bolt directly in, however ZJ D30s are low-pinion, and it will actually be a downgrade for you.

 

The rear axle is not even worth it. ZJs have coil and link rear suspension, so the axle would need a decent amount of work to make it fit in your MJ. D35s and ZJ D44s are not worth the trouble.

 

Honestly, you will be better off finding a complete XJ for a donor. Front axle is a much better option, for the most part the wiring is going to be a direct swap (since XJ and MJ engine bays/dashes are the same), and fiddling with the rear axle will be easier.

 

Something you may want to consider though... Since your MJ is a 4 cylinder, it probably has lower gearing than the 6 cylinder donor would have. If you're going with any sort of lift or larger tires, you'll probably want to keep your existing axles. If you have a 2.5/4 speed now, and you go with a 4.0/auto donor, chances are pretty good the gearing will be the same. (3.55)

 

Broken down, really the only thing feasible to use from a ZJ is the longblock unless you have too much time on your hands.