Originally Posted by treys
Hey Everyone and thanks for reading...
I am swapping my 92 YJ 4cyl to a 6Cyl. Going from the AX5 to the AX15. Can anyone shed some light on driveshafts? I have a choice of transfer cases. Either the np231 that my jeep came with or one from a 1999 Grand Cherokee 6cyl. I understand I will need to change the output shaft if I use my current tcase. What about the Grand Cherokee unit? Anyone know if stock 6cyl drive shafts will work? And the last wrinkle... 4" rough country susp. lift with 33" tires.
Thanks to everyone!
I just did the AX5 to AX15 swap.
Every Jeep is different, so do the swap and then MEASURE for your driveshaft lengths. Generally speaking, the rear driveshaft will be shorter, and the front driveshaft will be longer because the AX15 is longer. It will also depend on where you weld your engine brackets to the frame.
Through the years, Grand Cherokees had one of three transfer cases (231, 242, 249) - which one is it? I'd recommend that you use a NP231, and install a 23 spline input gear into your NP231, if necessary.