I don't know why this thread was reported to the moderators, but...
To the OP:
You do not give enough information WHY you want to drop the rear diff ratio.
People have already asked you if this is a V8 swap, but you do not even answer that question.
If this IS NOT AN ENGINE swap, I'm not sure what you're trying to do.
Dropping the rear diff ratio ON A STOCK ENGINE RX-8 IS A STUPID IDEA.
If you're are trying to conserve gas mileage, you're going to end up with a slug of a car.
Lowering (numerically) the rear diff ratio will significantly affect the acceleration of your vehicle.
If you're fine with that, you're better off getting rid of the RX-8 and buying a Fiat 500.
I doubt this is some crazy 20B swap...
If you have resources to do something like this, you shouldn't be asking us how to find such parts.
Please use the REPORT icon to report INFRACTIONS - not because you're not getting the answers you want.
-Ted
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