I never had any luck w/ the steel pans. They always leaked.
I've had the thick cast aluminum pans ever since. My old 727 had one of the factory reusable plastic gaskets on it. Reused it a few times and had no leaks. Then that trans exploded on the starting line in 2008...so that gasket is no longer w/ us.
Both of my current 727s have a regular cork gasket on them now. No leaks.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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