Rebuilding C6?
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Senior User
Joined: Feb 2003
Posts: 135
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Rebuilding C6?
The tranny had been slippin pretty bad in my brothers 88 7.3 for a couple of weeks. Well it finally went the other night. It will not move at all in forward gears, but will in reverse. For some reason the truck would not ever kick down to 1st gear, and it would always take off in 2nd when the truck was in drive. We always had to pull it down to 1st to get it to take off in 1st, it just would not do it if you left it in drive. Anyway, i am wondering how much of a job it is to rebuild one of these ourselves? Thanks for any help!
Junior User
Joined: Jun 2004
Posts: 89
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From: Oceanside, Ca
It's my understanding that attempting to rebuild an automatic transmission yourself is a BIG mistake, unless you're a certified tranny mech, and unless you have a whole shop to do with. There are too many parts inside an automatic to do it in your standard garage. I suppose you could do it yourself, but you'd probably end up having to take it into a garage to have it fixed at the end. That, and if you've ever seen a dissassembled automatic transmission, you don't even want to think about trying to work on it yourself. Take it to a shop, it'd be safer. On that thought though, I believe there's a vacuum line, or diaphragm that acts as the kickdown to drop down in gear...it's possible that that's messed up and might be your only problem. I don't know specifics on it, but that was what was wrong on mine...(I didn't fix it though, the guy I bought it from fixed it before he sold it to me)
Elder User
Joined: Jun 2002
Posts: 519
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From: CT
Google C6 rebuild video or go down to the tranny section in this forum and you'll find loads of info.
I'll be rebuilding my C6 shortly. I expect the rebuild to cost $400 doing it myself -- $900+ shop cost.
I'll be rebuilding my C6 shortly. I expect the rebuild to cost $400 doing it myself -- $900+ shop cost.
Tuned
Joined: Aug 2003
Posts: 363
Likes: 15
From: west central wisconsin
Just thought I'd mention that I have a c-6 in a 89 F250 that works great. I will be pulling the 7.3 out of the truck to replace the blown 7.3 in my dump truck. I have no need for the auto trans. Still in the truck and you can come test drive it. Will be pulling the engine in the next week or so.
Posting Guru
Joined: Oct 2003
Posts: 2,438
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From: Monroe, WA
I've been through a few C-6s over the years. As long as you are pretty organized and can keep all the parts in order, and have a good solvent tank to clean all the parts I'd say pick up a tranny manual and go for it. As far as building the internals I like to stand the case up on it's tail by bolting it to an engine stand by the pan surface. I've tried building them laying flat and always end up with something crooked. There's 2 cents for ya.
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