I've searched all over this board and can't find the answer.

Basics:

'95 YJ 4.0L/Stock Auto trans/NP231 w/SLE 1TonCV drive shaft
SOA front D60 rear 14-bolt 5.13r/p 36 TSL-SXs

Got the project off the jackstands early spring and I've been wheeling all summer.

Problem: When climbing steep angles in 4-Low (past about 45 degrees) the transmission/torque converter drops out and I roll back. It'll catch again when the angle reduces but drops out again when I get into the climb. Fluid levels are fine.

Anybody have an idea what's wrong before I tear into the tranny?

Thanks in advance.

I have a 94 YJ 4.0/999/D300 and have never had a problem with the tranny on steep climbs. I had the stock pan and now have the deep pan for the extra fluid capacity. I say get the deep pan and see what happens.

My TJ will do that every once in a while, pisses me off...as well as scares me haha.


Hey Rockslut, Just curious...did you use your 231 when you have yoru 38s? I'm thinkin bout puttin a 4:1 in my 231 and ill be running 38.5 SXs. Just curious as how it held up.

Originally posted by Wish4YJ
Hey Rockslut, Just curious...did you use your 231 when you have yoru 38s? I'm thinkin bout puttin a 4:1 in my 231 and ill be running 38.5 SXs. Just curious as how it held up.

I have only ran a D300 in my rig. With the SX's i had a GM D44 and with the 40's I have a GM D60