C-6 wont shift untill high RPM

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C-6 wont shift untill high RPM Empty C-6 wont shift untill high RPM

Post  capncruncher1965 on July 18th 2018, 5:19 pm

My trans has been rebuilt buy a good trans man it shifts great  from 1st to 2nd but you have to turn about 4200 for it to shift into drive.once it shifts it shifts firm and im running about 55 if i back off the gas any it downshifts right back to 2nd. Trans does not have a kickdown hooked up.
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C-6 wont shift untill high RPM Empty Re: C-6 wont shift untill high RPM

Post  whitefield on July 18th 2018, 11:59 pm

capncruncher1965 wrote:My trans has been rebuilt buy a good trans man it shifts great  from 1st to 2nd but you have to turn about 4200 for it to shift into drive.once it shifts it shifts firm and im running about 55 if i back off the gas any it downshifts right back to 2nd. Trans does not have a kickdown hooked up.


Governor stuck, modulator valve bad or wrong one the modulator pin , or valve sticking . check vacuum going to the modulator valve. Kick down or throttle valve stuck in valve body.
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C-6 wont shift untill high RPM Empty No kick down hooked up

Post  capncruncher1965 on July 19th 2018, 1:06 am

Dont have a kick down hooked up think that is the problem? Im going to check the vacuum to the modulator tommaro.if it has  vacuum which modulator should i use. Thanks for your reply
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C-6 wont shift untill high RPM Empty Re: C-6 wont shift untill high RPM

Post  Gregaust on July 19th 2018, 5:38 am

Sounds like a vacuum issue . Either no vacuum . Make sure vacuum is full manifold vacuum.
Did see similar with a C4 that was hooked to ported vacuum

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Post  stanger68 on July 20th 2018, 8:12 am

I wouldn’t waste my time Just take it back and make the guy fix it if you paid for a rebuild it should be right.

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C-6 wont shift untill high RPM Empty Got vacuum.

Post  capncruncher1965 on July 21st 2018, 9:19 pm

Replaced all the rubber hoze from carb to modulator it has vacuum for sure now will test drive tommaro to see if that fixed it
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C-6 wont shift untill high RPM Empty Re: C-6 wont shift untill high RPM

Post  Gregaust on July 22nd 2018, 1:21 am

capncruncher1965 wrote:Replaced all the rubber hoze from carb to modulator it has vacuum for sure now will test drive tommaro to see if that fixed it

Must be FULL manifold vacuum from the intake , if it is on the carb ensure it is NOT ported

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C-6 wont shift untill high RPM Empty Got it fixed

Post  capncruncher1965 on July 27th 2018, 12:21 am

Put new vacuum hoses on it turned the screw in the modulator qutar of a turn out and bingo shifts perfect. Thanks guys for all your help and replys. Love this website
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