Ford Mustang Forum - View Single Post - 1966 c4 is not shifting well from second to third
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post #2 of (permalink) Old 08-15-2019
imps
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Joined: Jul 2017
Location: Mohave County
Posts: 146
 
Quote:
Originally Posted by Tlkmap View Post
Hello,
Suddenly my green dot <acronym title="transmission">trans</acronym> 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.
Is the complaint specifically that the engine speeds up during shifting to 3rd.? This indicates slippage, most likely in the High Clutch. No Converter trouble.

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