I recently purchased a 2004 Mazdaspeed w/o engine or trans. This is my #5 NB and making it a comfortable cruiser. I have a LS V8 330/380tq. Will my Mazdaspeed Diff and axles survive? They appear quite a bit beafier than the regular NB diffs.

Anyone aware of the limits? Search was just returning sale ads

Thank You

 

I haven't seen too many LS miatas trying to use the OEM diff. That said, the MSM axles are bigger and the torsen is known to hold up to ~400whp in street car applications. The torque behind that LS might eat it, especially if you wheel hop, though. Send it and let us know how it goes!

 

Depends on the tire and road conditions.

I broke 3 MSM axles with a 1.8L BP drag racing with drag radials with 350whp and with 400whp. Then I swapped to a built ford 8.8 axle with 900hp rated driveshaft shop axles and never broke one again.

For the street on street tires, the MSM parts took 500whp and never broke.