71 Delta 88 conv differential ID

[seasand77]

I need a replacement or rebuilt stock differential to include the ring and pinion. I've been told the Cutlass will not work, but that every big GM car that year used the same rear end. Impala, Catalina, Buick, etc. Is this true? Rocket raider says the Cutlass will work, but my local chapter president says it will not. I'm confused.

[rocketraider]

Re-reading my original reply, I see where I have confused you. The Cutlass axle will not bolt into a Delta 88 drum-to-drum. It's the gearset and carrier section that is the same between Cutlass and 2-barrel Delta.

You still need to measure the punkin to see which rear end you have. Then you can narrow your options.

If you're looking to replace it drum-to-drum, you should be able to use any 71-76 GM big car axle except one from a wagon. The Chevy might have the light duty axle. The C-body cars (98, Electra, Caddy) will have big brakes.