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68 transmission problem
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Posted by: Jimbo_Jack

ok guys and gals i just got m 68 mustang last night its a 6 cyl. automatic and its having some problems shifiting into 3rd at the right time what could be the problem my dad says the filter needs cleaned but what do you people think

Posted by: stang351c4v

Quote:

Originally Posted by Jimbo_Jack

ok guys and gals i just got m 68 mustang last night its a 6 cyl. automatic and its having some problems shifiting into 3rd at the right time what could be the problem my dad says the filter needs cleaned but what do you people think

Does it not shift into 3rd when its cold or all the time. If it doesnt shift into 3rd before the fluid gets warm then its most likely your seals are getting old. I had the same problem until the fluids got warm then it shifted ok. I have mine in the shop getting new seals and gaskets now. Hope that helps you, Mike

Posted by: fordtech523

Check to see if you have full manifold vacume at the vacume modulator valve on the right rear of the transmission.Check all vacume lines and hoses.If transmission fluid runs out the vacume line replace the valve and all rubber hoses. Be carful not to lose the metal pin on the inside of the valve when you pull it out. The valve may be fality and not leak. Also check the kickdown linkage to verify it can move without binding,Lube all pivot points of linkage.If the kickdown is ok and it still does not shift after replacing the modulator then you might have a direct clutch seal that is hard and not sealing but you would also have a slipping condition when it shifts into 3rd gear but you did not mention anwthing about that so I would say you have a vacume problem with a bad hose or modulator valve.I hope this helps. You have a C-4 tranmission in this car.

Quote:

Originally Posted by Jimbo_Jack