The title was supposed to say "Need an A/T expert"

Okay, I have a problem with my automatic transmission.
Basic TH125C.

after about 15-30 minutes (15miles or so) the transmission begins to leak transmission fluid...
I started to assume it was the torque convertor seal since I didn't replace it when I had the engine and transmission out, but then started thinking that it may be the torque convertor itself!

the transmission only slips when it gets low on fluid, and it only leaks when the fluid is hot.

I put a 2.8 in that I rebuilt and also put in a slightly higher stall torque convertor. this leaking problem wasn't happening before I did the motor swap, so its logical that the t.c. could be the problem I already have the seals ready, and have the stock convertor to put back in, if that is the problem.

I however do not know for sure how to check the t.c. to see if that is the problem. the seal, I am replacing regardless.

I have Thursday, Friday, and Saturday of next week set aside for me to drop the cradle and separate the motor and trans, and put them back together. Any input would be welcome and appreciated!

[This message has been edited by AL87 (edited 07-26-2013).]

To test the converter for leaks, use a single hole rubber cork
and pressurize it slowly to about 5 to 10 PSI to check for weld leaks.
Don't go too high in pressure, as it gets dangerous.

any opinion on what may or may not be the problem causing the leak?

If it's coming down from around the torque conv, it's 1 of 2 things, the seal(most likely), or the front pump "O"ring. the seal for the conv is pressed into the front Cover. the front cover is Part of the pump (when you take out all the bolts in a circle, and pull the pump cover) there is a huge "O" ring that seals it. More than likely It's the converter seal. the Converter" itself" has nowhere to leak from unless it has a "pinhole" in the weld, or a "crack" in the neck.

so... what is it?

Its not the torque convertor seal...

Well , now you need a converter, a seal AND a trans. the trans won't last long with all that metal pumped into it, That's rotten luck.

hahaha, I have a low mile 88 trans, and convertor, I got the seals.

I just don't get how this happened... too much bump shifting up and down?

you say "higher stall converter". What is it out of ? I see it's a GM converter. Maybe Not "matched" to the neck on THAT Trans.

quote Originally posted by Lou6t4gto: you say "higher stall converter". What is it out of ? I see it's a GM converter. Maybe Not "matched" to the neck on THAT Trans.

its out of a buick that had a 2.5 and the trans was from that same buick. the stall is 2095 over the stock 2060.

the torque convertor is an FDAB which has a higher damper rating st about 215 ft/lbs over... 104 ft/lbs...
IDK what the internal damper does in a torque convertor, but its higher... (usually bigger means better, LOL)