CRT.5 build - would opinions on my setup choices

[lincpimp]

I am using a 4s 4000 maxamps pack. Basically took the emaxx chassis and cut out one battery tray. Made a plate to go across the top off the CD and stood the tray on its side. The stock hold down can be used with 3s but I used longer screws with 4s. Heres a few pics, works fine for me. I have the same setup in a LS10, slightly larger truck, but slightly lighter than the crt.5!? The pics show a 20 tooth pinion, that is what I ran with the 3s setup.