I have a 63 with a 65 rear end. I acquired a correctly dated 63 rear carrier. I have heard gossip that I can't put the 65 carrier and gears in the 63 pumpkin. Is this correct? If so what does one do when wanting the correct rear end in their 63? Something about obsolete parts? Thanks, Scott!
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Re: C 2 rear end
Someone correct me if I'm wrong, but I believe the only difference is that the '63 - '64 ring and pinion set has a different spline count on the drive pinion, which requires a specific companion flange.
Bottom line is that everything should go into the '63 carrier, and having the "wrong" companion flange is not a judging issue.
As long as you have to make the swap, replace any parts that are worn or out of spec. Measure the side yoke end play and if it's more than about .030" either the yoke ends are worn or the clutch pack is worn (assuming it's Positraction). Good yokes with a new clutch pack should yield no more than about .010" yoke end play on a Postraction axle.
The different carrier might require a different pinion shim to achieve proper pinion depth and, of course, the case bearing shims will likely require changing to get the combination of proper bearing preload and ring and pinion backlash.
I co-authored an article in The Corvette Restorer about a year ago that explains the finer points of axle overhaul, and you should review it.
Duke -
Re: C 2 rear end
Scott, I have the same question. I have a correctly dated 63 carrier that is empty. Currently in the car is a 76/77 rear. It's OBW-1281. The casting date will tell me if it's a 76 or 77. Anyway, will the 76/77 posi case and gears all transfer to the 63 carrier.
HarryComment
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Re: C 2 rear end
AFAIK the answer is yes. Everything is interchangeable between '63 to '79 carriers. The only footnote is the different companion flange required if you use a '63-'64 ring and pinion set.
DukeComment
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Re: C 2 rear end
Duke is correct the Eaton unit will fit in the 63-64 housing. The 63-63 used a Dana unit which is not servicable.(junk)Many of the early cars have been switched out by now anyway. The 76 posi case is better then the early cases too. The spiders are better then the early cars but the clutches are junk.
I have a paper on the corvette forum and a post with many pictures on doing a custom build on these. If you're considering the job you should review it.
Check the pinion flange as Duke noted. the 4 spd cars used a 3.25 joint and the auto's ,BB, and later C3's used the larger 3.625 joint.Comment
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