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The simplest way to go is probably obvious: Find an 8 3/4 axle for your model car. ALL B body axles were what is called the "large" bolt pattern. Only the A body 8 3/4 axles came in the small bolt pattern. As far as I have found, ANY 8 3/4 3rd member can physically fit into ANY 8 3/4 housing. They all use the same 10 bolt pattern. Also, in mid 1969, the '489 case 3rd member was phased in and ran until the axle went out of production at the end of the 1974 model year. The ones that had Sure Grip differentials were the Cone type. Great when new, but when they wear out, they are not easily rebuilt. A clutch type SG can be rebuilt though if you can scrounge one. They are NOT being reproduced, so you'd have to find a used one.


I thought the clutch type sure grip were being repopped. Did they quit. Hope so make my 4 or 5 stash worth that much more.