I've had a tmaxx 3.3 for about a year now. I definately recommend new bulkheads and skid plates. Like Olds mentioned spring steel or the RPM 3 piece nylon has worked well for me. +1 on rollbars I run 20% nitro from Odonnells. 105 does not produce as much power and 30% is kind of pushing the engine at it's envelope for safety.
As far a a parts stockpiles: controls arms if your staying stock, center driveshafts, and maybe a set of turnbuckles.
As far a a parts stockpiles: controls arms if your staying stock, center driveshafts, and maybe a set of turnbuckles.