George16... my only question: Will I have to put different pinions in (3905 E-maxx or Jammin buggy)? I know you have done a lot with gears...
Yes. It all depends on what final gearing you want to run.
Castle Neu 1520 on 6S LiPo Powered Gmaxx (Nitro Killer)
Predator with OS .21TM
Supermaxx with Mach .26
Revo with OS .18TZ
Kyosho ST-RR Conversion
Ofna CR with Tekin ESC/Motor (2)