• Welcome to the new NAXJA Forum! If your password does not work, please use "Forgot your password?" link on the log-in page. Please feel free to reach out to [email protected] if we can provide any assistance.

np 231 input question

flyingbrick

NAXJA Forum User
ok so i just bought a 231 w/ a jb sye this weekend...
i'm trying to figure out if i'll need to change up the input shaft or not, the case came from a 2.5L yj and i have a 1990 AW4 4.0,
http://www.novak-adapt.com/knowledge/np_nvg_input_gears.htm
that link shows the AX5 that came with the 2.5 has a short 21sp input and it says "AW4 (through 1990)" is this just hit or miss on my part due to the transition year? I've never replaced a tcase let alone open one to replace things. I do have a 23sp short input but i think i may need a medium input.. lazyness on my part there.
 
All pre '91 (non HO) AW4's were 21 spline. You're fine.

I have an '88 w/AW4, and the Tera 4 to 1 that I have came out of a 4 cyl Wrangler with an AX5, both 21 spline inputs.
 
Back
Top