Hard to tell from the pics, Joe. If the coil spring mounting pad is flat, it's at least a 64-66. The 65 and 66 GS had larger diameter wheel bearings. If the housing flares to a larger diameter where the wheel bearing is, then it's most likely a GS unit. Best way to ID, is to find the stamped code on the bottom of the right axle tube. If it was a posi, it'll also have a '0' with an 'x' in it.
It has the flat spring perch so its a 64-66 housing. If the numbers on the ring gear are 14 41 GMC then its a 2.93 gear. If those are spacers or riser the rubber bump stops are mounted on those were on GS cars.
Maybe these will help. The numbers on the case are: C5D S 1375689 The tubes are flared and the ends. Thanks
Maybe if I can get some real solid confirmation, i'm sure there's someone out there that needs this rear for their car. Any old rear would be fine for my application.:3gears: Thanks for the help Ed
The flared tubing ends look right. They flare out about 1/8" on my GS rears. On the plain Special/Skylark rear, it flares only slightly....less than 1/16" Station wagons used the large diameter wheel bearings too.... I'd have to check on my casting numbers. To know for sure, you have to find the stamped code on the bottom of the axle tube. That would positively ID it. or.... -find a part number on the brake backing plates (if you have them). GS used thicker plates. - Get a part number off of the wheel bearing. '66-up used RW-507G, the '65 used a different one, maybe RW-507A? Are you selling it? what gear ratio is it?
