Got a 92 yj with a 2.5 and a 5speed with an 231 t-case, Also got an 89 xj with a 4.0 auto and 242 t-case. Xj is a parts rig, I am thinking about swapping everything from the xj into the yj, I am going to put the xj springs on the yj and extend the wheelbase so driveline lengths should not be an issue. (length on tranny/t-case) Any big problems I need to look out for? Pretty straight forward other than wiring? Tips or pointers?

For the most part, it is straight forward. Here is a writeup I did when I swapped a '98 XJ driveline into my '89 YJ (http://www.chrr.ohio-state.edu/~bogrees/html/tech/40swap.html).