ehhh...they aren't necessary. With a 8 or 9 tooth pinion and lathe motors, you have plenty of torque and its slow enough.


Speaking of RC4WD....check this out


http://www.rccrawler.com/forum/showthread.php?p=199836


88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride