I did a similiar swap about a year ago. Used a '85 XJ, 2.5, 5 spd, 4wd for donor into a '86 MJ, 2.5,4sp, 2wd donee. Only problem was rear drive shaft. Everything else was unbolt, move over, bolt back up. I have a stack of drive shafts and I went thru them and was fortunate enough to find a close fit. Had to swap the spline end at the U Joint because of spline count. U joints were identical Unfortunately have no idea what it came out of. Really recommend getting the complete XJ, if possible, over chasing parts.. Use what you need, Sell the rest. You just can't beat the convenience of having the two sitting side by side when swapping parts. :wrench: