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Old 11-30-2010, 05:10 PM   #4
68 TT
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Join Date: Jul 2009
Location: Spokane, WA
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Re: Put TH400 back in, won't shift

Quote:
Originally Posted by cppursell View Post
Yessir, he reports his vaccum is plugged in correctly to the intake manifold, and there is a good suction. I suspected this myself as possibly being a problem. Maybe his modulator is bad?
The kick down circuit probably wouldn't keep it from shifting. I would bet you are correct and the vacuum modulator is bad or damaged and leaking vacuum. Without it functioning the trans will not shift out of first gear.
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