with the smaller motors you should run a much higher stall and much steeper gears to compensate.

so if you want to run say the Trex in the 5.3 or even Ms4 or pollluter then think of running a 4400 stall, 456 gears, 26" tall tire. as long as it clears it will run fairly well and as for drivablity its all in the TUNE. it will have the topend for sure just lack alot of low end thats why converter and gear is there