I solved the leaking speedometer gear leak on the transmissions. If you take the housing out of the tranny, and remove the pinion gear and shaft, there is a O ring in the housing. Pop it out with a dental pick, and size it up at the parts store. I installed the new O ring in less than a minute.   One less leak to worry about.

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Comment by Gérald Fourdin on October 2, 2012 at 11:39am

Ok thanks for info !

Comment by Russ Austin on October 2, 2012 at 9:04am

I dont see a need to drain the tranny. Just run the engine for a few minutes, just in case the tranny has internal leakage (good call David).  Have a catch pan ready, just in case.  

Comment by Gérald Fourdin on October 2, 2012 at 4:35am

Hello, I sometimes lose my oil Turbo Hydramatic TH-400 transmission. Also known as the small O-ring that is in question. I would like to place a new O-ring, is work hard, should we drain the transmission oil? Thank you for your

Comment by David Thomas on September 30, 2012 at 7:44pm

This is a fix you can do on the 63 Hydra-Matic without loosing fluid. Unless all the fluid is in the bottom of the transmission from internal leakage. The shift linkage O-rings are another source for external leakage. Unfortunately, you have to drop the pan to get at those.

Good Post Russ, The spedometer drive was a pesky leak I eliminated on my 63's transmission, also.


Comment by Jason Edge on September 30, 2012 at 8:14am

Good information. I put a link to this thread on the Help Topics Page.

Comment by Russ Austin on September 29, 2012 at 11:57pm

Tony, the fix is for the Hydra-Matic tranny.  Should be the same for the Turbo.   I pulled the piece out of my parts transmission,  so I dont know if the tranny will leak when pulled.

Comment by Tony and Ginny 429 on September 29, 2012 at 10:48pm


which trans does your fix apply to  ?

i think your 63 has a hydromatic

did you have any issue with trans fluid leaking out during the repair ?`


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