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Old July 31st, 2008, 09:38 PM   #1
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Default how hard is C6?

so i bought a 70 f250 highboy that is supposed to have a bad trans, the guy said it just quite going foreward in all the gears. so i bought a 2wd c6 from a tbird. now i don't know jack after i pull the filter off. do i need special tools or advice to change clutches, pump, whatnot around? advice.
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Old July 31st, 2008, 09:40 PM   #2
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Gotta be handy with those special snapring pliers is all
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Old July 31st, 2008, 09:51 PM   #3
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not a problem there, i've got a kick ass set of mac's. what else
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Old July 31st, 2008, 10:01 PM   #4
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That's about it, the c6 is about as simple as they come, just one of the snaprings requires three hands unless you're really good, everything really just drops out. First time take LOTS of pictures, and have a nice big clean organized area to lay everything out in order.
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Old July 31st, 2008, 10:13 PM   #5
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cool. thats what i was gonna do. and i've got 5 bays to lay my parts out so space or tools arn't an issue
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Old July 31st, 2008, 10:15 PM   #6
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Cool, have lots of clean rags, and PM me if you hit any snags. Shouldn't though.
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Old July 31st, 2008, 10:19 PM   #7
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5 bays and 6 things of clean rags. we just upgraded from the white paperish one's to the really heavy duty blue towel-like rags. i love em.
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Old July 31st, 2008, 10:25 PM   #8
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Good deal. Let us know how it goes
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Old August 1st, 2008, 10:22 AM   #9
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why not just swap the trans, i thought highboys used divorced t-cases?
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Old August 1st, 2008, 03:58 PM   #10
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cuz i don't have a yoke that fits the other trans
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Old August 1st, 2008, 09:02 PM   #11
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I put a 77 F250 2wd C6 in my 79 4wd F150. Had to swap the output shaft and tailhousing obviously to mate to the NP205.
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Old August 1st, 2008, 10:07 PM   #12
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dude your testing me here. I haven't had to do one now in 25 years.

if I remember right you have to pull the filter, then the servo cover and pin. small screw driver to pop snap ring. after you pope the pin back out the adjuster bolt for the second gear band. if your doing it on a bech you have to bolck it so its sitting on its tail end to pull the pump. once you unbolt the pump use a rubber mallet in the converter pump drive to tap it loose. once it pops you pull straight up. the shaft in the center of the pump goes into the third pack. pull that and the second gear band together. once you have them out the forward pack is right there. most likely its smoked. I have done it so bad as to melt the gut together.
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Old August 1st, 2008, 10:09 PM   #13
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well it took me 45 minutes, but i've got trans 1 down as far as i think it needs to be. gonna get the parts trans torn down this weekend. i stoped right after the sun-a-ma-bob. the clutches after that looked good so i'll reuse em. the hardest part was getting the damn pump to let go of the case.
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Old August 1st, 2008, 10:19 PM   #14
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theres a pair of hole in the pump housing bolt holes that are threaded to accept a apair of slide hammers. I doubt anyone has a pair so I suggested the rubber mallet.

as for the sungear and shell I am the only person I know who has ever stripped the teeth off the bell :)

by the way pull the vacuum modulator. I bet your pin is either missing or the modulator is bad.
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Old August 5th, 2008, 10:48 AM   #15
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well the trans is back together and the damn yoke won't turn!!! i found this a very easy task so i'm going to take it apart and see if i maybe didn't get something lined up/ put in all the way. oh and the second set of clutches that you come too were smoked.
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Old August 5th, 2008, 12:25 PM   #16
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ok it's workin now. took a break, tore it down again and re assembled it. spins nice now

*damnit*edit: found a extra shim just now. maybe the third time is the charm...

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Old August 5th, 2008, 01:08 PM   #17
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if your mechanical it won't be hard at all. I rebuilt my tf727 and its based upon the same design. MAKE SURE YOU AIR CHECK THE VALVES BEFORE INSTALLING TRANS BACK INTO VEHICLE. I forgot to do this, and had no forward running gears, just Revers. Did the air check and found that something wasn't rite. Had to pull it back out, rushed it over to KillerB and he found I installed a piston in backwards lol. Put it in correctly for me, went home and installed it. WORKED !

There is one snap ring that is very big and hard to get out, but if you have good pliers you'll be set. Just pull the specs on how much clearances you need for the clutch packs and everything. Check the end play when done. Just take your time.
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Old August 5th, 2008, 04:16 PM   #18
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third time is the charm! got it. now 2 find out if it works
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Old August 12th, 2008, 11:00 AM   #19
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so did it work?
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Old August 12th, 2008, 11:36 AM   #20
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haven't put it in yet
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