I know the Kimbrough would bolt in, but I didn't have the right selection of gears to make that work: the smallest pinion I have is a 15t and the only spur was 66t, WAY too huge to fit.

Serum, I had some issues with the 5300/7018 system from the first time I put it in that truck, I think it's 'cause I had the rear wheels too tight and a couple of the tranny screws were rubbing on the slipper plate, but now the 7018 is dead. I think the 5300 is still good and has another year of life left in it, so I might get a Mtroniks controller from Hobby People when we start carrying them.