The Dreaded Tranny Pan Leak
Here is same what I do for valve covers as well as the tranny pans.
Clean pan surface and tranny surface, bolt thread holes and bolts and threads with Brake Parts Cleaner to remove any trace of oil or oily solvents.
Then apply thin layer if black RTV Gasket Maker to both tranny and pan gasket surfaces and a thin layer to both sides of new cork pan gasket.
Then coat bolt theads with Aviation Sealer (like Hi Tack) to seal threads to the case.
Assemble the pan onto the tranny with light but snug torque to the pan bolts, tightening them evenly as you go around 3 times.
Let sit overnight to let RTV cure. Put in your tranny fluid, check when warned up and leave a pint low on the 727s so that you are not overfilling it.
Check when idling in neutral. Leaving the tranny 1 pint low leaves room for torque converter drain back so the fluid level does not go above the shift shaft seals and forces the fluid out.
Can seal the nut and band adjustment bolt threads with Aviation Sealer too as fluid will seep from there also if unsealed.
Never leaks as long as your shift shaft seals are good. Same for 904s too.
If your front seal at the torque converter is leaking, well that is another story . . .
Here is same what I do for valve covers as well as the tranny pans.
Clean pan surface and tranny surface, bolt thread holes and bolts and threads with Brake Parts Cleaner to remove any trace of oil or oily solvents.
Then apply thin layer if black RTV Gasket Maker to both tranny and pan gasket surfaces and a thin layer to both sides of new cork pan gasket.
Then coat bolt theads with Aviation Sealer (like Hi Tack) to seal threads to the case.
Assemble the pan onto the tranny with light but snug torque to the pan bolts, tightening them evenly as you go around 3 times.
Let sit overnight to let RTV cure. Put in your tranny fluid, check when warned up and leave a pint low on the 727s so that you are not overfilling it.
Check when idling in neutral. Leaving the tranny 1 pint low leaves room for torque converter drain back so the fluid level does not go above the shift shaft seals and forces the fluid out.
Can seal the nut and band adjustment bolt threads with Aviation Sealer too as fluid will seep from there also if unsealed.
Never leaks as long as your shift shaft seals are good. Same for 904s too.
If your front seal at the torque converter is leaking, well that is another story . . .
