A New Post has Been made to the thread [Rear Disc Brakes]
The Reply was:
[b]Never saw a 5.29 ratio listed in the Mazda spec books. As far as I remember, the '74-'75 autos had a 4.88, manuals had a 4.6, '76's had 4.11, and '77's came with 3.9s.
You are correct, in that the entire rear end, including the diff, would have to be changed. To the best of my knowledge, the diff on a REPU is not interchangeable with any other diff, except B series/Courier. There is where the big advantage to a rear end swap could be found. You will have a greater availability of gear ratios, and diff options such as a limited slip/posi diff.[/b]
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