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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

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.
miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was
69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been
69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc
68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E
79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars
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