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Discussion Starter #1
I have a 1994 F-250 4X4, with a C-6 Transmission, it has 55000 original miles on it, but I am experiencing problems with it shifting.
When just accelerating slow it will shift up, and downshift repeatedly until I give it quite abit of throttle, then it will shift correct, this happens in both 1st to 2nd, and 2nd to 3rd. If I accelerate half throttle through full throttle it will shift through the gears great.

Any ideas as to the problem?

Thanks,
David
 

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hi Dave,

Does that newer trans have a vacuum modulator valve? I had the vacuum hose break one time on a 1972 C6 and it would only shift at a fairly high RPM.
 

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Yes it does, that was my first thought, and I checked the hoses and all were hooked up, maybe I just need to trace it and replace it to see if it has a small break that I can't see.
I just got home from the races, and it pulled and shifted great, but with the 5.8 I have to keep my foot in it to pull the trailer and 5000 lb. race truck, and like I said, when you have your foot in it, it does great.
 

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Discussion Starter #4
What about it guys, no clue to what this could be?
 

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could be an issue with the governor?

Honestly I'm not really in the know on the non electronic shift controls.

give me a pcm controlled unit or a full blown manual vb-trankbrake etc I'm your man.
 

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I have seen c4 do this on the 1-2.Not the 2-3 but i guess it is possible.Here is a quote for C6 from a transgo book i have.

Complaint: Bump-Bump-Bump at 8-12 mph
Cause: Governor not stabilised allowing rapid shifting up and down from low to second
Fix: Install transgo SK6-7 shift kit
 

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Discussion Starter #7
Sounds like the governor might be the problem, now a dumb question, where is the governor located?

Thanks for the replies.
 

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take off the extension housing and here is a pic of the governor.



:mrgreen:
 

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Discussion Starter #9
Thanks for the illustration, that looks easy enough. I will check in to this. 8)
 
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