Question about 1966 Ford Mustang

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C-4 transmission slides between 2nd and 3rd under light acceleration

Transmission is relative fresh rebuild and shifts firmly in all 3 gears under hard acceleration but slides between 2nd and 3rd under light acceration. Reverse also slips on all occasions. Also, it blows fluid under hard accelaration in 3rd gear only

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Is it over filled?

You cold try cleaning the valve body

I guess you have a modulator,is that
leaking fluid,pull of vacuum hose & check

Posted on Dec 01, 2012

  • tom fry Dec 01, 2012

    The trans is fresh rebuild and all is spotless. I have also changed the fluid including the torque converter. I have done a quick check on the modulator vacuum which is seems ok but have not done an exttensive test.

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Have a 2004 scion xb and have hard time shifting into 4th gear what can be wrong

Posted on May 05, 2014

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Posted on Jan 02, 2017

Wolfman304
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SOURCE: My 1994 Ford Explorer automatic transmission won't

Hi there,

As your Auto transmission is fully electronic, it could be anything from faulty sensors sending incorrect signals to the trans computer, or faulty internal components. Your best bet is to have the trans computer scanned for 'fault codes' (as the computer monitors and retains all faults) by your local Ford dealership.

This process will identify the likely component/s which are causing this problem.

My guess is, there may be a problem with the 2nd clutch (yes that's right, automatics have internal clutches!), input and/or output shaft switches sending incorrect signals to the computer.

But, there could be so many other possibilities....so, I recommend you get the codes scanned and go from there.....

Posted on Nov 12, 2009

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Two problems okay..


For the key issue, try shooting some wd-40 into the tumbler, and working the key a bit. If that doesn't correct the issue, eventually you will need to replace the tumbler.

The hard shift is most likely not related to the clutch. As long as the vehicle has good acceleration, and you don't feel slipping, the clutch is fine. The issue may be related to a damaged cable, or to the linkage at the transmission itself.

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