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Old 03-17-2012, 07:05 PM
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Join Date: Jun 2007
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Posts: 1,204
Default Any Chevy TH400 Experts?

Finished the 454 for the Green Monster and the motor runs great. Put rear brakes in the C/20 as well. However the trans is now a problem.

The TH400 goes from 1 - 2 fine, but doesnt want to go into 3 until near 4500 rpms.

I replaced the vac modulator and have over 15 vac at modulator off intake.

I cleaned and inspected the governor. Looks fine and valve moves.

I put a static vacuum pump to keep it at 20 and drove it with no shift from 2 - 3

I am thinking kickdown- disconnect the kickdown switch/solenoid at trans? Its pedal actuated.

Any ideas?

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