How do I find an 8 3/4 rear in the jy

HSDemon said

Dana67Dart is correct, you basically need an A-Body car that came from the factory with a 4bbl engine. Although, I believe that starting in 1974 (could have been 1973) all the A-Body high performance cars, with the 360 4bbl, went to the 8/14" rear end, the 8 3/4 was no longer offered after 1974.

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I have to disagree with HSDemon -

The last year for an 8 3/4" rear in an A-body was 1972. That also had a 4" bolt pattern and the smaller brakes. The cars didn't need a 4 barrel engine to come with an 8 3/4", but it guaranteed it. There were 273 and 318 that could be found with them.

Starting in 1973 A-bodies came with 4.5" bolt pattern and B-body sized rear brakes when optioned with front disc brakes. But the rear was an 8 1/4".

(1976 /6 A-bodies may have been available with drums all around and the 4.5" pattern but I don't recall the details.)

Sixpack_Sid - does your '75 Duster have OEM front discs & 4.5" bolt pattern all around or drums all around with a 4" bolt pattern?​