its is a kit but for some reason they preassembal the frunt and rear ends....every thing els is up to you. (i know i walked my manager through the assembally), and with the trans the set screw for the shift, turn it in all the way and then back out 3 1/2 turns and you should be good. also the slipper for the spur gear tighten it all the way the 1/2 turn out the instruction its says will melt the pad to the spur.

and again NICE CHOICE....and half fun with the weelies!