1988 Chevy Camaro It is stuck in first gear

1988 CHEVROLET CAMARO
100,000 MILES • V8 • 2WD • AUTOMATIC
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1988 Chevy Camaro mileage: rebuild. I have a freshly rebuilt 350 turbo transmission with 0 miles. I have put it in three times after pulling it out to have the builder recheck it for the same problem. It is stuck in first gear and will not shift up. It has reverse and park. It will not manually shift nor can shift by bypassing the vacuum module (running it up in first gear then shifting manually). In addition, the governor seems to be functioning properly. Please help if you have anything else I can try or might have missed, for I am at the end of my rope. Thanks again,
Nov 9, 2010 at 8:42 PM
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Check for vacuum at the vacuum modulator with the engine running. If okay, you may have a faulty modulator.
Nov 9, 2010 at 8:44 PM