RCV FSAE tripod housings are made from high alloy 4340 steel and heat treated for superior strength.They are also are profile milled around the tripod shape, and the stub shafts are bored out to reduce weight. Black oxide coating is standard.
RCV Part# D4486
For more info check out www.rcvperformance.com or check out the downloads below.
RCV Performance Brochure - fsae_brochure.pdf
Torsen - D4486.step