You can't fit a hard case lipo in the jrx-s pro because the bulkheads are in the way and then if you were to shave away the bulkhead (which you should not do) the pulley rubs on it. But you can fit a soft case lipo which isn't roar approved and most tracks don't approve either
Team Terribles---------2009 post of the year
"Cant you read Mopar???He said that he drives a T-max 2.5!!!!"
Spec classes are for communist