4l60e twisted input shaft splines out of the drum
But Few questions, This is not something we have seen alot of with either the sleeved or unssleeved drum. Yes it happens occasionally but not on any regualr basis. What shift kit are your using, Are the shifts super agressive. Are you by chance letting the converter lock during shifts?
About the only times we see this is in heavy 4500 5000 pound trucks and we have several of them turning well into the 11s.without doing this.
Tell us a bit more about you car and trans?
PM me what you got
Frank
Why should he stay away from them?
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