I buy almost all of my parts from amain.

The ring and pinion gears are different for the ST (45/11). The rest of the differential is identical to both the Mayhem and Turmoil buggies (cup, spider gears, cross shafts, pins, outdrives, etc.). In fact, the ST shares most of its parts with the buggy. Basically, if you don't see it [link=http://www.amainhobbies.com/index.php/cPath/1_25_287]here[/link], then it's listed under the buggy.

What I did was purchase two complete mayhem buggy differentials from one of the eBay chop shops. Got them for much cheaper than the parts cost seperately. I then sold the ring / pinion gears to a local racer for less than they cost in stores. That paid for both differentials, and then some. Walla, free spare parts!

-Howard