OK, I have a 2000 TJ 2.5.  I am swaping it with a 4.2, HO, Bored over .030 I6, with an AX-15.  I currently have a AX-5.  I am taking the motor from a YJ that has been running it.  I will be swapping the motor, X-fer case and tranny all as a mated set.  

Question, what spline count issues will I run into, and will I have to replace drive shaft?  

The motor is carb'ed and I wanted to stay with my injection, but I will have to do this at a later date. Any advise on this?

Thanks  

Your kidding me?  Someone answer my post.    

If you are using the 4.2L tranny and transfer case where would you have spline count problems?

I think you will be disappointed with the 4.2 until it is injected. This also depends on the condition of the carb that's on it. Howell makes a great affordable kit to convert it to EFI using a GM throttle body. Your 2.5L fuel injection will not work on the 4.2L engine.

I suspect the front driveshaft will need to be shortened and the rear lengthened.

This will be a somewhat costly swap for what I feel will be less than great performance. It really makes more sense to sell the four-popper TJ and get into a 4.0L version instead. Much less costly and less labor intensive.  

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If you are using the 4.2L tranny and transfer case where would you have spline count problems?



I was just wondering the same thing...