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)
Lito is correct. Without the tranny mounts you cannot mount a normal 3906 Maxx tranny. Of course you do have one option, which is to mount one of MonsterMike's universal center diff mounts and run a center diff unit. Your only other options would be to find a set of tranny mounts, ask Robin if he has a set, or make your own from some aluminum plate. Best of luck.