seriously havent searched very much have you. PAR straight cuts/helical cuts. GTX I think. Mfactory diff. Quaife diff. It just takes some time using the SEARCH function to find your answers
I had read about PAR gears...but I had also read they'd discontinued production of them...misinformation maybe?
I know of the Mfactory AND the Quaife differential. Lentech and level ten also offer differentials for the auto guys.
I'd LOVE to continue use of the search button, but with information hidden so DEEP in build threads 250 pages long, it would take two years to find information that a lovely poster could have typed up in the same time it took you to tell me to search, so hush...been there, looked, found what was readily available, been not only on Mazda247's search fields, but club protege, toronto protege, google, and the local mazda tuners....hmmm...two years to sift through a decade of information on these cars or two minutes to pick the brain of somebody with the experience...which is more cost effective? Time effective? I'ma go with the easiest and most effective solution...ask when finding the solution myself become difficult!