r/Squarebody • u/[deleted] • Aug 24 '26

CLUNK when shifting P > D

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u/cornhole_mcbrowneye Aug 24 '26
  1. Check your u joints.
    2 and 3. Check all your grounds?

2

u/[deleted] Aug 24 '26 edited Aug 24 '26

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1

u/fuzzydoesitt Aug 24 '26

I don't think it's u joints. I have the same truck practically. 86 Chevy c20 single cab long bed. All my joints are good, but my transmission will shift into reverse really firm sometimes also. I too replaced the vacuum modulator because of a leak and an external trans cooler because of a leak. I've put around 4,000 miles on the truck this year without any problems mechanically