I've been waiting along time to get ahold of Crankcase to turn him into Motormaster ever since seeing the pcc cars. This is still technically a WIP due to the fact I need to do some cleanup work, add some hands, and swap MM's head to something more g1ish. Here's the back story I came up with. Megatron realized one of the major flaws in combiner technology was the mental stability of the gestalt. Due to the rebellious nature of the Stunticons and Combaticons he stripped them of their spark and downgraded them to drones with only the remaining leaders keeping their sparks.