The pinion gears are sold here at RC-Monster.
Cold Fusion Racing makes a motor mount that you could use.
http://forums.radiocontrolzone.com/s...d.php?t=203863
SH Z-Car, Custom Crawler, 8s Savage,
12s XTM XLB 1/7 buggy,
4wd 4-link rear/IFS Pro4 truck,
Custom Hyper 10 Short Course,
Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz