Original Rear end type on my 70 Duster
I think the 8 3/4 would have been original, probably with the 741 case. That’s what was in my ‘71 Dart which is also a 318/904 car.
I don’t think the 8-1/4’s went into A-Bodies until ‘73, because there weren’t any SBP 8-1/4’s.
100% agreed.
There's no way an 8 1/4 would be factory installed in an A-Body in '71.
They were only available in A-Bodies starting in '73, and were big bolt pattern ONLY.
Chances are that the 8 3/4 with the 741 case in the car is original, but it also could have had a 7 1/4 too.
Back in the day, I owned a '71 Duster 318, 904, and 10'' drum brakes.
It had an 741 case 8 3/4 in it.
The car was all original except paint.
However, I currently own a '71 Demon Sizzler that is all original except the engine that is a 318, 904, and 10'' drum brake car and it has the 7 1/4 rear end in it and it hasn't been touched from new.
It doesn't make sense to me that the Sizzler would have a 7 1/4 in it seeing that it was destined to be a ''budget'' performance car....
So, it seems that at the build plant they threw in whatever was available at the build time unless the build sheet called for a heavy duty rear end ONLY...
