Originally Posted by TrueYJfan
Thanks how can you tell the difference between the NP231 amc and the 231j?
There is a round tag on the back of the t-case that is red and silver that has the identification numbers on it.
If the tag is gone, look at the transmission. If the transmission has
a seam running the length of it along the bottom, that is a BA10/5. The BA10/5 is a 21 spline whether it's a 231amc or a 207.
If there is no
seam, it's an AX15 and it's a 23 spline which is the 231/J.
Originally Posted by monkeyhouse
so if you get an ax-15 and the T/C the t/c will bolt up ok? That's cool.
Yes. If you buy the tc with the trans (ax15) it will bolt up. BUT, the pilot bearing is a different size in the flywheel. You will have to pop that one out and put the one in for the AX15. They are available at any good auto parts store for under $10.