what are the best 2 spur sizes motors are monster stock , a gm pinnacle and p2k. way back when in stock we went with one of the smaller spurs and a medium sized one for stock depending on the size of the track

for the t4 they take a "special" spur gear because the slipper pads are hex shaped. There are 4 of them 78,81,84,and 87. $4 /ea
Pinions get 12 through 18 should get you most ratios that you want.

87 comes stock, get and 84 if you want.

I dont think you'll get anything under a 16t pinion on the truck. Theres just not enough adjustment in the motor plate to get the motor that far forward. I could be mistaken. Get 16,17,18,19 and you should be ok

sweet thanks guys