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post #1 of (permalink) Old 08-15-2019 Thread Starter
Tlkmap's Avatar
Joined: Mar 2018
Location: Carlsbad
Posts: 45
1966 c4 is not shifting well from second to third

Suddenly my green dot trans is having difficulty shifting from second to third. The engine revs up and will shift if I let up on the throttle or if I let it rev. I had a transmission shop repair a shift shaft leak 4k miles ago and it was working fine until now. I checked the fluid level which was high and there were some bubbles on the dipstick which made me think it was cavitating. I drained 8oz of atf out, which put it at the proper level. I replaced the modulation valve and made sure the vacuum hose was in good shape (even put a zip tie clamp on the hose). Now I’ve drained 16oz and added “Bar’s leaks” additive that says it will improve shifting. Nothing has helped. Should I pull the transmission and rebuild it or could it be the torque converter?
I appreciate any and all ideas.

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