Shifting at high RPM - The 1947 - Present Chevrolet & GMC Truck Message Board Network

12-14-2023, 10:33 AM

#10

Captain J

Registered User

Join Date: Nov 2017

Location: H, Q

Posts: 180

Re: ****ing at high RPM

Quote:

Originally Posted by geezer#99

Modulators are adjustable. Poke a small flat bladed screwdriver in the end of the nipple and contact the pin inside. Turn the screw out 2 turns, hook the hose up and test drive.
If it gets better try another turn.

It was difficult to find the pin inside and was hard to turn, but eventually I managed to turn it counterclockwise maybe 2.5 turns. Ill conduct a test drive and see.

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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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