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My transmission on my 77 Ford half ton, two wheel drive, no

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Hi mike. My transmission on...
Hi mike. My transmission on my 77 Ford half ton , two wheel drive, no ac, comes out of gear when driving. When it kicks back into gear I can drive but when I stop say at a stop sign, it goes out of gear. So back into park, then drive and off I go again. I pulled the vacuum line off of the modulator valve expecting to see transmission fluid but it was dry. Could the valve still be faulty anyway or could I have a problem with the vacuum line. And if that may be the problem, where would I look for the connection at the engine or wherever?
Submitted: 2 years ago.Category: Ford
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Answered in 33 minutes by:
8/19/2015
Ford Mechanic: Mike S., ASE Certified Technician replied 2 years ago
Mike S.
Mike S., ASE Certified Technician
Category: Ford
Satisfied Customers: 7,772
Experience: ASE Certified Master Technician
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If the modulator diaphragm was busted you would most likely notice the white smoke pouring out the exhaust tailpipe.

How is the transmission fluid? Is it full? Does it still look red or does it look brown and smell burnt, which brings me to my next question, does the fluid smell burnt?

have you tried dropping the pan and seeing if there is a lot of debris in the pan, make sure the filter isn't clogged up with that debris?

If not, I would start with that and perhaps while you are at it, go ahead and install a new filter and an gasket and refill with new fluid.

You might also want to check the linkages down there for the gear shift, the kick down for being loose, etc. Also grab ahold of the tailshaft and try real hard to move it side to side and look up at the bellhousing bolts to make sure they are not loose and the bellhousing rocking back and forth.

If it has an intermediate band, go ahead and adjust it. If there is or was a lot of debris in the pan, that means something is worn out, most likely the clutches and/or bad and possibly even something else and it would then be time to have that transmission rebuilt or replaced.

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Ford Mechanic: Mike S., ASE Certified Technician replied 2 years ago

I see this is a C4 and has 2 bands, an intermediate as well as a rear band for low/reverse. Here are the instructions for adjusting both.

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