Converting 999 non lock to lock up

[nico]

I have a 999 auto in my 86 cj7. I want to put lock up in this. Can i just get a lock up converter to a 999 with lock up and put in my auto , or do i have to change anyting else???? Anybody done this before ??

[tufcj]

I don't think so. The hydraulic pressure for the lock-up converter comes in thru the main shaft. It's hollow, and I believe there are special ports inside the valve body. If the swap is even possible, it would also take a full rebuild of the trans.

Bob
tufcj

[superhog88]

input shaft different valvebody is different have been told that the case is different as well but never looked to verify