Testing : Items included : 2 speed drum for screw on gears, 2 shoe and hardware used : Associate* TC3 : lighter 8 mm one way adapter:

Titanium shaft [ only if after test shows material is suited for this application] weigh test model: 24 grams lighter then stock Impulse 2 speed.                     Items; 2 speed drum . one way adapter , Associate* parts 18 grams lighter

for this conversion to work you must have the Serpent first speed gear carrier and drive shaft.

Test’s showed this conversion can be used on all Impulse series cars ----  including the Serpent 705 series [ special nut -included] and Impact   ----- with stock 2 speed drive shaft- and Serpent first gear carrier