LOSI PISTONS IN SHOCKS & Q'S

[Windy]

HI GUYS,

HAVE JUST GOT A RB5-SP NOT SURE IF GOT THE WORLDS REAR END ON IT, IS THERE AN EASY WAY OF TELLING IF IT HAS?ALSO IS THERE A GENERAL SET UP FOR THE CAR LIKE THERE AWS FOR THE LOSI XXX-CR AND ALSO THE AE B4 THAT IS PRETTY CLOSE WHERE EVER YOU GO, MOSTLY RUNNING ON GRASS. aLSO HAS ANY ONE TRIED LOSI PISTONS IN THE SHOCKS AS THEY MAKE A HUGE DIFFERENCE IN THE FEALING IN THE ASSOC SHOCKS? GOT A 7.5 BRUSHLESS MOTOR CAN ANYONE GIVE ROUGH IDEA OF PINION AND SPUR SIZE FOR IT? ANY HELP WOULD BE APPRECIATED.

CHEERS

WINDY