lol this is how a 4WD shaft works... lol

[==] _________ [==]
| |
[#]-------------- [+]
| _________ |
[==] [==]

[#] is the front gear box... [+] is the motor... and ----- it the rubber belt... and for the blind noobs [==[ are the tires. lol now think about it... the belt spins both the front and back tires...