TH400 help
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I have a TH 400 that I just got in my truck and, it's not shifting right. Could it have to do with this (see pic below) is this supposed to be hooked up to a vacuum line?
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Re: TH400 help
Yes, vacuum modulator. Hook it to vacuum & see if it shifts better.
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Re: TH400 help
Just to clarify, it needs to be connected to manifold vacuum.
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Just some additional tidbits.......From the pic, I believe the modulator maybe adjustable as well....so you can take a small screw driver and adjust the set screw in the modulator....turn the screw clockwise will firm up the shift (later) and counter clockwise with soften the shifts (earlier) ....
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Hooking up to vacuum fixed the problem. It shifts good now. I felt and looked around on the valve body, but didn't see or feel a screw to adjust how it shifts. Thanks to all for the help!
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The adjustment screw on a vacuum modulator is inside and accessed thru the port for the vacuum hose.
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Also there was a steel line that ran down there from the factory. Attached at the intake behind the carb and to the modulator with a 4" piece of rubber hose. A long rubber vacuum hose going all the way down there can weaken and colapse.
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Re: TH400 help
Thanks to everyone for the information, it is very appreciated!
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