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# of bolts and locations match up.it may be newer then the ones you have.could have a ford or chevy rear in it as well.figured by the wheel stands its in a junk yard.
I dunno about it being a 8.25. All the one's I've seen are a little more oval and have the fill plug in the rear cover. If I had to guess just based on looks I'd say it looks more like a GM 10 bolt as odd as that may be. However in looking at the picture, is that a fill hole on the right hand section of the diff cover?
I've heard that certain versions had some non-interchangeable parts, and that the "oddballs" had gears all the way to 2.45. Maybe this is one of those.
That looks just like the 8.25 rear that originally came on my '70 Satellite. It also has the 2.71 gears. Definitely an 8.25 as most people here have said. Mine is available without brakes for $10 in Los Angeles if anyone wants it.
Yall are makin this way too difficult. If the axle is a transplant, it'll have evidence such as rewelded brackets and places where brackets have been removed. If it has none, it's factory.
Keep in mind too, the cover itself could be throwing you off. If the center bulge is more round, it can make the whole thing look round. The bolt pattern is what you're concerned with and that very first pic, the bolt pattern is oval.