After getting a 1st to 2nd slip develop after the drags a few weeks ago, and then the box gradually starting to feel real loose recently I took it to get looked at last week by the guy that re-built it only 2500k's ago.
Found out today that the clutches were fried, bands were fried, servo was scoured beyond salvage and it also needed a new planetary set as well.
So this was a quality rebuild only 2500k's ago by one of WA's most respected trans specialists (there's really only 2 quality outfits over here anyway). Have run a huge trans cooler with thermo fan since it was installed and did all the do's with this box and none of the don'ts.
The box saw maybe 10 1/4 mile passes and probably 30-40 similiar full power runs on the street.
As to what I think is a C4's ability to handle a strong 351/378 stroker combo .... well....