If you want to do a 4x4 'Pede (which is what it sounds like), I did a write-up a while back on how to do it.
http://4x4pede.freehomepage.com/
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