set your diffs first with the slipper set tight, so you can feel if they slip. set the diff by holding the spur and turning both wheels together using a high grip surface like carpet. you wont get it right by turning one wheel and holding the other as the diff slips easier that way and it is easy to overtighten it causing excessive wear. its hard to describe the correct feel, its something you learn over the years, but basically when you drag the car along holding the spur and pushing down on the wishbones, the tyres should slide and the diff should also give a little too, although not much. do front and rear diffs seperately, setting the front a little tighter than the rear. once you have set your diffs then back off the slipper until it slips fairly easily by hand, adjust the slipper then under motor power on the surface you are going to be racing on, you want it to just give enough to stop the car popping up the front wheels, most of the time when giving the car full throttle from standby you should hear the slipper slipping for the first half second to one second only. bit long winded but hope it helps!
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