nitro dave .... do u want your rs540 to run like its a mod motor ???
u will be beating and overlapping everyone on the track with the 540
first PROPERLY break-in your motor
second spend the extra few bucks on pinion and spur combination of a final drive ratio of 4.8 - 5.2
maybe 108 spur and a 44 pinion for a 5.2 Final Drive ratio combination
OR 108 spurand 47 or 48 pinion for a fdr of 4.8
hehehehe u will be running like a mod motor !!!!!!!