The transmission extension housing seal was leaking so I decided to try and replace it myself. Getting the old seal out wasn't much of a problem. Unfortunately, I was unable to lift the vehicle high enough to get an adequate swing so I could drive the new seal home.
After some thought, I made an installer tool using three bolts, a hose clamp, a fabricated piece of plywood, and the seal installer. It worked quite well.
The installer on the left is store-bought and designed to hold the seal while tapping it in with a hammer. I fabricated the collar on the right with a piece of 3/4" plywood.
The bolt heads are held securely against the transmission housing with the hose clamp. The orange color is the seal. By sequentially tightening the nuts, the seal is slowly and evenly pushed into the extension housing.
