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Re: Shifting at high RPM
Update
Installed new vacuum modulator,
Refilled trans oil to the correct level
Drove the truck,
No change, it will not shift ������
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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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