i just purchased a spur gear adaptor for my DI, its made by a gentleman in assuie land, and lets the DI accept spurs like kimbrogh and kawada. still dont know if im gonna install a slipper or not, i guess i should since im runnin the novak 5.5 BL setup. i dont really plan on racing this car hardcore, but it would be nice to have some protection for the gears. i have already smoked a rear diff (the diff ring slipped on the plastic retainer) and have found a way to modify a set of TA04 out drives to fit,as the stock ones have seriously gouged out where the axle pin rides. i also installed a complete set of DF-02 cvd's and they fit like a glove.this time i played it smart and glued the diff rings to the plastic adaptors(diff housings, in tamiya speak), so i shouldnt have any more trouble with it.