c6 shifting troubles
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Junior User
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c6 shifting troubles
i have a 77 f150 shortbed 4x4 i just got done redoing rebuild the 400. the problem is the tranny now. if you shift it manually it works good till you get to 3rd then it slips for a little bit. but it wont shift very well if its in drive. i was wondering if it was due to the truck sitting for the last 7-8 years not running and it just needs to be driven a little bit? or if i have to find a differentone or get it rebuilt
Cargo Master
Joined: Apr 2009
Posts: 3,038
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From: South west Idaho
My c/6 sat around about 6 years and gave the same problem. New one fixed it. They never had the correct one in stock so i got one with a different color of stripe on it. It turned out to be better as i had changed rear gear ratios and it made it shift better than the old one did before it quit. But if it shifted correct before ,then i would recommend getting one just like whats in it. I think there are about three or more of them and you can adjust them ,at least the ones i have used you can.
Cargo Master
Joined: Nov 2009
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From: starship enterprise
Yes, start with a modulator. When yoou pull it out some oil will run out. I started parking my trucks on a steep hill or jacking up the rear end and doing it then to avoid the exxon valdez coming through. If that doesn't fix it, i would recommend a fluid change to get the valve body De-gunked as much as possible. A modulator would be cheaper and easier.
I prefer the ones with the adjustment inside. those you can adjust and tune and set it where you like it.
I prefer the ones with the adjustment inside. those you can adjust and tune and set it where you like it.
Posting Guru
Joined: Sep 2003
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From: Northeast LA
My C4 was doing the same thing about a month ago, I followed the suggestions, changed the modulator and adjusted the intermediate band, but it didn't help at all. And F250 Warhorse isn't exaggerating about the Exxon valdez when you take out the modulator either so be prepared. Anyway it didn't help mine at all, I ened up having to pull the transmission and rebuild it, turned out my clutches were toast.
Hopefully just replacing the modulator will work for you though.
You might also want to drop the pan and change the filter along with the fluid change that was suggested.
Hopefully just replacing the modulator will work for you though.
You might also want to drop the pan and change the filter along with the fluid change that was suggested.
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Cargo Master
Joined: Nov 2009
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From: starship enterprise
that is where I would start. jsutton is on to something too. wore clutches will act as described if it has a lot of miles or has been overheated. I would do the modulator and fluid both probably. On the leaking pan, those are prone to leaking but they have been overtightened and distorted in mine. I like to put a good straight edge all over on the pan and try to get it back to square again with a mallet. Sometimes a block of wood helps too. good luck
Posting Guru
Joined: Sep 2003
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From: Northeast LA
It wouldn't be too hard, I should have put one in mine especially since I had it out and apart but didn't because I wasn't sure if my rebuild was even gonna work right since it was my first attempt. LOL
Posting Guru
Joined: Sep 2003
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From: Northeast LA
Most common is the green stripe. I think people like the black stripe too, IIRC the black stripe makes harder shifts, but not 100% certain on that part.
EDIT: That may just pertain to a C4, I'm sure someone else will be along shortly.
EDIT: That may just pertain to a C4, I'm sure someone else will be along shortly.
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