Difference between 242 and 249

[old_man]

I am helping a kid with a Grand Cherokee he got. It has a 249 with a bad viscous coupler. We scored a deal on a 242 and a 249 as a package deal. I am looking at helping do a swap this Saturday. He wants the 242 instead of the 249. Are the driveshaft lengths going to be the same? Any other swap issues?

 

[NW-ZJ-SCOTT]

Re: Differences between 242 and 249

Tom, I just did a 231 swap into my Grand cherokee, due to the Viscous coupler problem with the Factory 249.

Both Driveshafts should swap in Without a problem, Now where you MIGHT have a problem is the input shaft length on the 242 possibly being different in length then the 249.

There is alot of info on Google for a quick "Input shaft gear swap" I, on the other hand didn't have the issue so that is about as far as i can go with that.

A Tip would be, At the same time you swap the 242, Upgrade the front Driveshaft and Pinion Yoke to XJ equipment. Do away with the CV Driveshaft.

 

[Begster]

Re: Differences between 242 and 249

This is a pretty good write up for exactly what you want to do. Everything looks to be the same I think.

http://jeephorizons.com/tech/tcase.html

 

[old_man]

Thanks for the link. I'm hoping I don't have to crack the cases and swap the planetaries, but if I do, its not that big a deal.