In the process of making the switch to the 4.1. While waiting for the kit, I ordered the following:

JCI2135 JConcepts Aluminum 12mm Front Clamping Hex Wheel Adapter
JCI2091 JConcepts Aluminum 12mm Rear Clamping Hex Wheel Adapter
TLR5172 Team Losi Racing Front Shock Spring Set (2.5 Rate/Red)
TLR5166 Team Losi Racing Rear Shock Spring Set (1.8 Rate/White)
TRA3768 Traxxas Shock Spring Retainers (Upper & Lower) x2
ASC7496 Team Associated Hex Front Axle Set
ASC9880 Team Associated Hex Steering Block Set

Proline hex wheels.

Are the red and white springs the way to go at SRS Raceway in AZ? What about pistons and oil? Any help in finding a starting point would be appreciated.

Since I have a leftover shorty stick pack from my 22, is anyone using one in the b4.1?