Nice! IMO 70 MPH is all the fastest I'd want my Rusty to go, it's just not stable enough and the drivetrain is so weak. I'd push something better designed and made for offroad use to 100 or so, one tiny mistake at that speed and your car is done though. My Hyper 7 TQ is setup for street use and currently I'm pushing about 50 MPH on 4s and it's fast enough that it doesn't turn very well (straight-line speed gets boring).
Have you looked into the HPI RS4 MT dogbone conversion? Snellemin runs this setup in his drag Rustler, I haven't had a major enough failure to justify the investment but I'm looking at doing the conversion when my steel U-joints finally let go. My Jato shafts are already ovalling the holes, I've got slop in my steel outputs, and I go through a stub axle every month or two right now. I wish Traxxas would re-design the entire drivetrain of the Rustler
