Thanks neil, appreciated the info about other peoples crap conversions.
HAHAHA
Actually the truck is very strong, nothing has broken yet and I have beaten the snot out of it. I replace the servo with a digital Hitec, and put a hardened 15t pinion on it. This cured the wear issue, and put top speed up a little. The diffs have worn in more, hope it continues and loosens up the drivetrain.