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The Parts
In addition to the new diff and new gears, there are a lot of other required parts.
Seals, bearings, spacers, crush collars (plural intentional) and pinion nuts are required for this job.
Mazda differentials for the RX-7 (FD and at least some FC), RX-8 and MX-5 have a number of interchangeable parts. The entire assemblies are probably interchangeable between the cars, though I don't know that for a fact.
These differentials all one piece spacers to set the backlash changing the lateral location of the differential in the case. Chances are the spacers you removed when you disassembled your diff will not be correct for installation.
After fooling around a couple times and trying to order just a few of these spacers I broke down and bought the entire set. Yes, they are expensive. The entire set of ~20 spacers at 16.00 or so apiece is $300+.
If you have the racer discount from MazdaMotorsports (I do) you can buy them for $10.15 each.
I was lucky with the pinion spacer - the one from my stock pinion happened to work.
Attached is what I think is a complete list of parts needed. The prices are all MazdaMotorsports racer discount prices, but you can probably get close to that from Malloy Mazda.
There are two pinion shaft seals included because they are about $10.00 each, and it's not too unlikely that you will mess one up and need another.
Buy lots of crush collars. I think I bought 3 or 4. There is one unused one left in my parts box. They are about $6.00 each. Buy extras. You may get the pinion preload right the first time, you may not. If not, the crush collar you used is now trash. Don't try to reuse a crush collar.
Next: Removal and Disassembly
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