This will be entirely aluminum with the case, gears, spur gear all aluminum and ceramic balls and bearings. Vented V2 slipper pads.
Parts List
Case
Diff Gear
Idler Gear
I bought these on Ebay from Dhawk Racing
Balls
Diff
Bearings
Pinion
I bought these from Avid. www.avidrc.com
Spur Gear
I bought these from asap_hobbies on Ebay
Top Shaft
FT V2 Slipper Pads
FT V2 Slipper Vented Hubs
Ider Shaft
Diff bolt/spring
Diff Rings
Screws
I bought these from Team Associated
Total Cost: around $175.00