Join Date: Dec 2001
Location: Belleville, Illinois
Thanked 22 Times in 17 Posts
Re: T18a Exploded diagram?
You finally found us. Welcome to the board!
There were two versions of the T18a, and I don't think either was available in '84 Jeeps. What you have was probably swapped out of something else. Just to give you a warm fuzzy, Ford pickups were common donors.
The difference was in the reverse gear arrangement. The case, top cover and shift pattern were different. In my stock '78 Jeep reverse is right and forward. In others it was left and back, I think.
I doubt that the different cases made a difference to the input gear, but you should determine which you have anyway. If you have a Jeep transmission, I can scan the pages from the '78 FSM for you.
On the subject of your engine build, I think you're headed in the wrong direction. The cam, intake and big valve heads suggest that you're building a high-power engine. Jeeps work better off road with lots of low-down torque, good smooth idle, and good off-idle throttle response.
What you have will work, but an engine built to move a heavy truck would work better off road.