C6 build questions
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Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
C6 build questions
I have two c6 transmissions I am trying to make into one good one. One is a very new slip-yoke 14 1/4" tailshaft style, the other is a flanged fixed yoke. I am putting the completed tranny into a 77 highboy, which already has a flanged fixed yoke in it that's dead to the world. My question is, both cases are big block, but the fixed yoke case has a bunch of ribbing on the top, squares cast into the inside of the bell, and S-91 cast into the top, while the slip yoke case has a smooth bell and S-99 cast into it. The case in the truck has squares and ribs cast in, but I don't know the number off the top. None of these have the factory tag on them, so I don't know exactly what they are from. Which would be the best main case to use?
Thread Starter
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Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Turns out, the fixed-flange transmission was nearly new, maybe 100 miles on it. Slapped it back together, adjusted the band and checked endplay, and called it good to go. One question I still have is what would have had the flange type output in the first place? The c6 in the truck used to have a very built 429 in front of it, I would assume it was from the same vehicle. Also, the trans I went through had a tag on the valve body, looked factory, that just said "HP" on it. Anybody know what that's about?
