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Re: Shifting at high RPM
Quote:
Originally Posted by dmb
He may have to pull the valve body Something is stuck somewhere, 400s just dont give problems as a rule
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I faced the same issue few years ago with my other truck, I found the vacuum hose was loose from the vacuum modulator, I reconnected it and shifting was fine.
My concern is how to return the valve body?
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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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