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Old 12-24-2023, 04:12 PM   #45
Captain J
Registered User
 
Join Date: Nov 2017
Location: H, Q
Posts: 180
Re: Shifting at high RPM

I managed to pull the valve out with a magnet as suggested, initially it did come out smoothly, I pushed it back with the magnet then out, I checked it, nothing noticeable, cleaned it then with the magnet I pushed in and out three times, it was very smooth.
Took the truck out for a drive, same issue will not shift. 🥱🥱🥱

I suspect that the vacuum modulator is the issue, but I’m no expert.😎

Someone said maybe the clutch’s are gone, but I’m no expert, that’s why I’m here.🤔🇶🇦🇶🇦

Out of ideas 🤒😏
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1972 GMC Sierra C2500, V8-350
1986 GMC Sierra C2500, V8-454
1986 GMC Sierra C2500, V8-LS1
1986 GMC Sierra K2500, V8-350
1987 GMC Sierra R3500, V8-454
1997 GMC Sierra K2500, V8-454
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