My 1961 Cadillac Tranny is leaking from O ring at gear select

[Jack Miller CLC# 24441]

My 1961 Cadillac transmission is leaking from (I Think) the O ring that goes around the gear select on the tranny body. I never worked on a transmission. It only leaks when sitting, not driving.
Has anyone here had this issue and can tell me what to do ?
Besides that the tranny shifts great.
Thanks
Jack
1961 Cadillac

[russ austin]

The shifter shaft and TV linkage need to be removed and have new O rings installed.  Call around to see who works on Hydra-Matics. Its not surgery, but a few precise measurements need to be made.

[P. Manoogian]

i did it on mine. get a service manual as it explains how. you can do it without removing transmission. You need to drop pan, disconnect linkage, etc. 90% common sense job. Get an o ring kit at parts store and you will find what you need.

[goofyhb]

Hello,

I have the same problem over here in Germany. Can anyone give the exact measures of the O-rings needed? Thickness and Diameter. I'll have to order them upfront.

Thanks in advance,

Axel

[Jack Miller CLC# 24441]

I ended up bringing it into a tranny shopmthat specializes in classic cars. My split converter was leaking, the reverse gear was stripped and the band's inside tranny were hard as a rock. Got everything replaced. Guy said it will bang a little from R to D till it sets.
Tranny great now with no mire leaks.
Jack
1961 Series 62 convertible

[Roger Zimmermann]

Hello,

I have the same problem over here in Germany. Can anyone give the exact measures of the O-rings needed? Thickness and Diameter. I'll have to order them upfront.
Axel

Axel, you can order just that kit here: http://www.autotran.us/ It comes with 2 O-rings, a washer and the small pin.

[bcroe]

Check the removed shaft for rust.  The problem here has been the shaft rusts
from the outside, then the rust destroys the seal.  good luck, Bruce Roe

[goofyhb]

Changed the seals last weekend. Also the O-ring on the tube to the pump. All were rock solid. I disassembled all valve bodies and cleaned everything. Still have a slow shift between 1 and 2 and a hard shift between 2 and 3. I had a whine from the rear planetary gears, but this is now reduced after a 60 mile trip on the Autobahn at 60mph. I probably have to work on the adjustment of the TV rod to get all the shifting becoming smooth like the 3 to 4 shift. I need to install a rev counter to better tackle this task.