C4 won't shift into Drive
- Joined: 12:10 PM - May 12, 2018
Have 1988 302 roller cam w/ oversize cam 4.98. My C4 tranny complete rebuild 1.5 yrs ago. Restored car put tranny back in and won't shift into drive. Just high rpms and only 30 mph. Have 1st, 2nd and reverse. Vaccum is dedicated off carburetor full Vaccum 3/16 hard line with Vaccum line on either end modulator has been replaced. Took it back to tranny guy five days later told me to come pick it up he can't figure it out. Says has to be something in valve body but he doesn't know what. Said had a stuck valve and he fixed that. Is my Vaccum line too small?
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