Re: TH-350 locking up in reverse??
I'm with Andy and something is stuck in your valve body. I would drop the pan and see what it looks like in there. I'll bet cleaning the valve body would most likely fix it but I would blow $22 and put a Transgo shift kit in it at the same time. If you look at Transgo's web site their trans video will show you how easy the valve body comes apart. I'm sure something is stuck in there.
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76 Chevy K20
76 GMC K15
77 Chevy C10
77 Chevy K10
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