anyone know the size rear end for the 77? I'm swappin my differential to 3.93s just for fun, little more acceleration while I wait to afford that performance twin turbo engine.

also, anyone know where I can buy differentials, other than ebay?

You can purchase rear ends from various company's. Such as Mid America, Ecklers, Paragon Reproductions, Contemporary Corvette.
And if anyone else would like to chime in and add to the list, fire away. Most places do have a core charge. So if you don't have one to exchange, be prepared to spend some extra cash.
As far as size of the rear end. A vette rear end is specific to a vette. Not like many other GM cars that had 2 or 3 different applications for one type of car.
I believe that 63-79 were all the same housing size. Correct me if I'm wrong though. 80-82 were different and will not fit your 77.
Sarge

|UPDATED|12/4/2004 3:55:43 PM (AZT)|/UPDATED|

Sarge81 said: Not like many other GM cars that had 2 or 3 different applications for one type of car. I believe that 63-79 were all the same housing size. Correct me if I'm wrong though. 80-82 were different and will not fit your 77.

thats my understanding as well.. although I believe there is a difference in the carrier for 4.11 + gears..

If you're going to do a swap, I've heard that for some reason, the later years were more prone to failure.

daveb12 said: If you're going to do a swap, I've heard that for some reason, the later years were more prone to failure.

on this subject...

does anyone know what the specific differences are between a

3.36 Heavy Duty posi and a 3.36 posi

example in 1969


3:36 Ratio AK
Positraction 3:08 Ratio AL
Positraction 3:36 Ratio AM
Positraction 3:55 Ratio AN
Positraction 3:70 Ratio AO
Positraction 4:11 Ratio AP
3:70 Ratio AS
HD - Positraction 3:08 AT
HD - Positraction 3:36 AU
Positraction 3:08 Ratio AV
HD - Positraction 3:08 AW
HD - Positraction 2:73 AY
HD - Positraction 3:55 AZ
HD - Positraction 3:70 FA
HD - Positraction 4:11 FB
Positraction 4:56 FC

anyone know what the real difference between an AU & AM axle is ??

|UPDATED|12/5/2004 2:34:56 AM (AZT)|/UPDATED|

If I'm not mistaken, the H/D diffs had larger stub axles w/ u-joint caps & bolts, compared to std. stubs w/u-bolts & nuts.

Adam's Apple is correct.

I called a local Corvette shop to find an answer. And the owner Larry was very helpful.
Regular duty (Smallblock) rear ends had U-Bolts w/nuts.
H-D (Bigblock) had cast iron caps with bolts.
The side yoke spline diameters and rear ends were identical between the two.
Hope this helps.
Sarge

thanks.. it was just curiousity..

i do have caps on my AU so thats makes sense..