Don't know about a 1971, but 1969 RE is for a 3.23 open diff.
In 1968 it was used to describe a type C rear axle (I think the C is for Chevy or maybe "c" clip???) with 3.31 gears.
I don't remember seeing a 12 bolt with 3.23 gears, so guessing it is a 68 housing.
Can you read the casting date code on the housing? Also, the casting number would be a clue.
Not unusual to find a chevy 12 bolt in a late 60's Olds.
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Last edited by Lynn; 02-17-2022 at 05:34 PM.
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