Originally Posted by Hey!
Who are you using to get your axels made?
was going to put a Viper rear in that I have but costs were too high and the rear hung too low.
Axles can be purchased from Panache in San Marcos, CA. www.v8miata.com
They also can sell you a complete 7.5" Ford IRS assembly with axles, custom machined spaces, rebroached Miata hubs, and differential hangers. Everything to make it a bolt-in operation. I know several people with Panache V8 Miata conversions, including three with KB blowers. In three years none have broken any part of the Panache axle assembly. All are on big street rubber (mostly 245 width, but no slicks).
If you're into overkill engineering (like me) and insist on the aluminum 8.8" you may have to make your own pumpkin hanger mounts. Martin Wilson (owner of Panache) has the patterns to make them but may or may not be willing to do so as he believes the 8.8" is overkill for any street car. He's built over 100 of them, so he knows what he's talking about.
Since this old post was revived, I'll share that I ended up buying a Torsen T2-R high-bias, worm-geared limited slip unit. Up to 4 to 1 bias is possible with this limited slip unit, which is far better than any streetable cone type or clutch type differential. They're expensive, about $600, but the cat's meow for a powerful street car where excellent handling is desired. These are standard factory fare in some of the world's finest factory performance cars. Only available for the 8.8" Ford, though, not the 7.5".