My sons 91 silverado has a bad clunk when shifting from park to other gears, worse when shifted to drive. We changed tranny mount, filter, center support mount, tranny tail shaft seal, and pinnon gear seal,also u joints at tail shaft . Truck was shifting nice and smooth, then I noticed his
steering coloum was coming apart at the hub so I put back together . And it started cluncking again , however I retarded the timing to bring idle down a bit and it started shifting good again. I also replaced neutral safety switch.
Any help would be greatly appreciated
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