Quote:
Originally Posted by wafrederick
Another part to check is the sunshell also known for breaking or stripping the teeth out.Also do this upgrade,throw away the 5 black springs in the direct drum.Aftermarket found out they restrict the clutches from floating and burn up clutches.The clutches work a whole lot better without those 5 black springs.
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If I had to hazard a guess, I'd say this is his problem - reaction sun shell. As you said, either the hub breaks off or the splines strip clean out. I'd invest in an SPX/Filtran "Beast" sun shell, it's about $10 more than the stock part and is much tougher.
This is the way I went back in '06 when I had a sun shell failure on my '88 9C1 (4L60). It's been fine ever since.
When this part fails, you lose reverse, 2nd (the high RPM indicates loss of 2nd and direct to 3rd), and overdrive.