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Re: Shifting at high RPM
Quote:
Originally Posted by Dead Parrot
What is your idle vacuum reading? Also check at the hose going into the modulator.
If your vacuum is low, it will make the modulator act like you are really into the throttle and keep the trans from shifting.
I managed to get me a vacuum gauge, but I don’t know how to use it, or where to connect it? Plus what to look for?
Check the kickdown switch and make sure it isn't stuck on. If it is stuck, it is telling the trans you are at near WOT and will also keep it in lower gear.
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It’s working, I disconnected the switch from the transmission, no change
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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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