going to change from 4.1 to maybe a 4.6 or 4.8 if available,does any one know of someone who makes these ring and pinon sets.Thanks

 

There is a 5.12 set from a first gen I believe but you need to modify the input shaft. The only "bolt in" set available is from the GTUs which is a 4.30. Ring and pinion sets along with there required spacers and bearings are not cheap, or easy to install. This kind of goes with the manual tranny. It's possible to DIY, but you're better off having someone else handle it with the proper tools.

 

Like Samps said, changing the ring and pinion is neither cheap nor easy. If you don't set the pinion depth correctly, your rear end will be noisey and the gears will have a shortened lifetime. I've just finished installing a 4.3 R&P set into a clutch type LSD drive unit (from an 86-88 NA) for my 90 GXL. The job turned out to be one problem after another, not to mention the tools that I needed to buy. I'm no newbie to rear end jobs, I've done about a half-dozen before. Most of them were Ford rear ends, but the RX7 rear end was by far the most problematic of them all.

The only way you'll be able to use a short drive pinion is to buy the adaptor that Mazdatrix sells. Last I looked, the adaptor sold for about $400 and the R&P set was about the same. Throw in the bearings, spacers, seals, etc., and your talking about $1000 for parts alone.

Now, if you don't assemble it propery, all those parts will be toast.

Hot_Dog
90 GXL
02 RSX-S