TH400 Trans Leak at Speedo Housing

[65 Fastback]

Originally Posted by Steve Cole

I did the same thing and mine still leaks too. I didn't change the inner o ring though, just the outer one. I don't know about the spring clip, maybe someone who knows will enlighten all of us. Let us know when you get it fixed and how you did it.

I just got an email back from a Transmission shop owner. He told me the retainer ring missing would not cause the leak.

He did say if your driven gear is old and worn out, fluid could be slipping by on the stem of the driven gear, especially if it has a ring groove where the inner seal rides.

I need to remove mine anyway and install one with 2 extra teeth as I changed my rear gears from 308 to 372 and the speedo reads 5/6 mph to fast on the gauge