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Old June 17th, 2008, 06:29 PM   #1
CheapThrillB2
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Default Ford C4 issues

My old man has a 74 EB with a C4. He recently purchased it, and after about a month he started to have issues with it shifting. When its cold (the truck), he puts it in reverse and it works great, but when he engages a forward gear the trans does nothing as if in nuetral. But after the truck warms up (like 10 minutes idling) the trans works awesome shifts smooth etc. He'll stop somewhere and if the truck cools back down same thing, has to wait for the truck to warm up before going forward again.

74 EB with a carbed 302, C4, not sure on the tcase. I did a tranny flush on it with the proper fluid and it made no changes. Hes gonna change the filter on it tomorrow.
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Old June 17th, 2008, 06:31 PM   #2
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id check the vac modulator and the vac line going off it, easy starting point. Could have a restriction in the vac hose or a broken diaphram in the modulator.

If that dont work id pull the valve body out to make sure the valves aren't sticking.

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Old June 17th, 2008, 07:01 PM   #3
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I would suspect the wrong fluid may have been put in. if so it may have stripped the clutch discs of the fiber coating. secondly the vacuum modulator has a pin in it that pushs the presure regulator. it may be missing from a previous repair. also look for vacuum leaks to the module. if by chance you can't find anything wrong just on a hunch check your trans cooler. crack the line loose and see if its flowing when cold. if not I would suspect the trans has a front pump issue with clearence on the vanes. when cold it could be leaking internally bad enough to vent presure from the applie pistons.
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Old June 17th, 2008, 08:44 PM   #4
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I had a c-6 that broke some hard parts that were a seal sureface, and that casued the same thing you are talking about with the exception of the temp different.
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Old June 17th, 2008, 08:58 PM   #5
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my a4ld did the same exact thing and it turned out to be the vac modulator on the side of the tranny.
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Old June 20th, 2008, 06:49 AM   #6
04 EDGE
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that transmission calls for type "F" fluid only. make sure thats what you use.
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Old June 20th, 2008, 11:20 PM   #7
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Quote:
Originally Posted by 04 EDGE View Post
that transmission calls for type "F" fluid only. make sure thats what you use.
x2, i got some extra type F fluid i never used, if ya want cheap it PM me, never opened
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Old June 20th, 2008, 11:39 PM   #8
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Quote:
Originally Posted by 04 EDGE View Post
that transmission calls for type "F" fluid only. make sure thats what you use.
yeah i am familar with what types of fliuds what trannies take from the 70's to 2008
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Old June 21st, 2008, 06:42 AM   #9
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ok good for you.
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