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94 Fleetwood Brougham
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They might, but having an extra 1.5 inches width on each side might be a real problem to fenders. Maybe use the Eldo/Toro/Riviera FWD rims to get the offset corrected.

They have the same basic setup, but I have never heard of it being done.Do some measurements and see.

Typically 74's had lousy gears, like 2.41's to 2.73's. Being a hearse, maybe it got better, but 3.23's was best gear they ever came up with. Granted a 7L Cad v8 would probably love it.

Remember, you can run any rear, 77-96 for the B/D body. The 77-79ish are the same rear as the 71-76 B/C/D, but just narrower.

Car-Part.com shows 77-84 rear ends as interchangeable. But we do know that 71-77 A/G body, 77-96 B/D body (except 9x wide butt wagons) all shared rear ends.

The main differences were bolt pattern and axle supplier (Pontiac 8 7/8" (not the 12 bolt!) 10 bolt or Buffalo (Chevy) 8.5"
 
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