OMG!! plz help
If the fluid still looks fine, maybe its something more simple like the turbine shaft seals on the input shaft. if they cross leak it will have the clutches opposing each other.
Have the converter you already bought cut cleaned and inspected though when you have it rebuilt assuming its a good brand name.
Like mentioned..there are some good guys here that can build them real well. They are not cheap either.
A good build will last.. I had my first 4L60E "built to handle" my 402 by a local guy..two passes down the 1000ft Track I shattered the Sprag, ballooned the Sunshell and Reverse Drum causing 3&4 Clutches to fly apart. Basically I had nothing past second.
I got a friend that runs a Tranny Shop locally and one of the guys there that used to build Race Trannies hooked it up with some tricks, that thing is a beast now. With a 3600 Stall it does good enough to pull consistant 1.56 60 ft's.
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