Modular Valve adjustment
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Laughing Gas
Joined: Jul 2003
Posts: 884
Likes: 13
From: Bassett Virginia
Modular Valve adjustment
OK, after tinkering with my truck today, I now think that my modular valve needs adjusting. It shifts real hard going into first gear when coming to a complete stop. Also, when I turn onto a road (for example) and I give it the gas, the truck will hesitate slightly, then the truck will act like it downshifts and it will just take off. Has anyone ever experienced this? My question is, which way do I turn the adjustment screw in the modular valve to correct this problem?
Posting Guru
Joined: Mar 2006
Posts: 1,182
Likes: 1
i'm not sure the problem is your vacuum modulator.
but- to adjust it...turn clockwise for higher shift point, counterclockwise for lower shift point.
to the best of my knowledge...that's all the valve does- alter the rpm at which the transmission shifts. (that's why i think the valve isn't the problem here.)
but- to adjust it...turn clockwise for higher shift point, counterclockwise for lower shift point.
to the best of my knowledge...that's all the valve does- alter the rpm at which the transmission shifts. (that's why i think the valve isn't the problem here.)
Cargo Master
Joined: Oct 2011
Posts: 2,251
Likes: 304
From: Kenner,La.
modulator
W-W, When you remove the vacuum hose from the modulator is there any transmisson fluid leaking out of the vacuum port ? If so get a new valve. Also measure the vacuum at the end of the hose and also where the hose connects to the manifold, some times these hoses will collapse. Try bypassing it with a new hose. Also make sure that the downshift rod from the carbureater to the transmisson is free and not binding.
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