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Had my Gal in a lift bay for 7 days straight doing Cold Case radiator install, FlowKooler water pump, Leed vacum pump, spring shocks, seat belts, fuse panel & wiring and more. Had planed on dropping the T-10 for a rebuild because of substantial gear oil leakage about "4 tablespoons full" on shop floor pan after driving car each time and parking it in the shop. But when it was up on the lift, the tranny looked real clean with no obvious leaky oily dirty areas visible. So we drained the tranny, taped and installed both plugs again, and filled with new gear oil. We had removed the flywheel cover, and it was dry on both sides of flywheel. Nothing coming out of tail shaft or speedo hookup either. We thought, well we will just wait and see now.

Friday I drove the car home to test and use over Fathers Day. Ran great, good engine temp, and finally awesome braking. Parked it over a freshly cleaned floor pan in my shop. Half hour later checked pan---- no oil visible. But on Saturday morning the usual 4 tablespoons full of gear lube on the floor pan.

I thought is there something on top of the trans that we cant see like a vent hole with the vent hose off. Desperate I Googled Borg Warner T-10 pictures and saw nothing on them that would suggest a vent hole. -------- note it only leaks after it has been driven. If it sets for a few days and I clean the pan no new oil will appear.

So now I'm taking it back to the lift this week and look at it again. What should I look for now???? Any suggestions ??? So close to having my driver back for the summer. --- Check out pictures.
 

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One place for a "mystery" leak is the solid steel pin that retains the reverse shift shaft.

That pin is tapered and installed from the top, so drive it out from the bottom.

Clean the case real good with brake clean and put a dab of silicone in the pin hole, from the top.

Install the pin, then more dabs of silicone on the bottom and top of the hole.

Use "The Right Stuff" brand.

That pin is above the static oil level, but it gets splash when driving.
 

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Discussion Starter #5
GalaxieX ---- As always thanks for your help. Your posts led me to do more research which led me to this 62 Galaxie T-10 on Ebay. My 63 Gal was built at the end of 62 and I believe the Ebay picture below would be my T-10 also.

This picture would seem to explain why the gear oils drip position always favors the driver side close to back of the "engine". The contour of the tranny case would guide the oil forward on the drivers side letting it finally drip towards the front of the tranny. It will be interesting to see if the hole is just completely open or what. The nylon case vent picture you posted is probably a viable replacement. What do you think ???
 

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One place for a "mystery" leak is the solid steel pin that retains the reverse shift shaft.

That pin is tapered and installed from the top, so drive it out from the bottom.

Clean the case real good with brake clean and put a dab of silicone in the pin hole, from the top.

Install the pin, then more dabs of silicone on the bottom and top of the hole.

Use "The Right Stuff" brand.

That pin is above the static oil level, but it gets splash when driving.
There is an O ring to the inside of that pin that is supposed to keep oil inside the trans. If the O ring is doing it's job , silicone is not needed.
Randy
 

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GalaxieX ---- As always thanks for your help. Your posts led me to do more research which led me to this 62 Galaxie T-10 on Ebay. My 63 Gal was built at the end of 62 and I believe the Ebay picture below would be my T-10 also.

This picture would seem to explain why the gear oils drip position always favors the driver side close to back of the "engine". The contour of the tranny case would guide the oil forward on the drivers side letting it finally drip towards the front of the tranny. It will be interesting to see if the hole is just completely open or what. The nylon case vent picture you posted is probably a viable replacement. What do you think ???

Yup

Your pic above shows the stock metal cap vent.
The tranny pic I posted shows the vent missing.
There is a small baffle inside the case that is supposed to prevent oil splash leaking out the vent.

It doesn't always work so well...

The plastic vent is a common GM part.

If your vent cap is missing, it will def leak there.

You could use the GM vent... or.... raise the vent....

I had a customer with a race prepped T-5 and he used a special oil and overfilled the trans 1 quart.

It leaked out the vent during racing. (road course).

I got a metal fitting with threads on one end and hose barb on the other end.

Cut threads in the vent hole in the case.
Screwed in the fitting and he ran a hose from there, up the firewall, and stuck the GM vent in the end of the hose.

No more vent leak.

This kind of thing (raising the vent) is common in the 4X4 world to prevent water from going into the trans (and diffs and T-case) when mudding.

HTH
 

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There is an O ring to the inside of that pin that is supposed to keep oil inside the trans. If the O ring is doing it's job , silicone is not needed.
Randy

The O-ring is towards the OUTSIDE of the pin.

I have worked on lots of T-10's and it always baffled me why they designed it that way.

I have seen many T-10's leak there.

A little silicone fixes it.
 

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