Need Some Input before i burn something up AGAIN !!!!

[TroubleMan]

Hi all,
Kinda new around here and wanted to post my build but working and getting time was like pulling teeth !!! Anyhow i fried my RX8 a few days ago and i really was surprised. i did run the truck for 10~15 minutes 2 or 3 times before this took place at the time it poofted i was running
19 pinion
48 spur
6 cell 40c
1717
RX8
any input would be helpful, when i started this build i wanted to use Monster XL but i never planned to run anything higher than a 6 cell so i figured the rx8 would holdup. Now i'm thinking i want a XL but maybe my gearing killed it with the wheels