C4 won't shift into Drive

Joined: May 12th, 2018, 12:10 pm

May 12th, 2018, 12:37 pm #1

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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Joined: November 18th, 2004, 4:20 am

May 12th, 2018, 1:25 pm #2

Did the inner valve fall out when the modulator was replaced? 
Is the pin in place?
If the valve fell out was it put back in the proper way? 
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