PMGR: Permanent Magnet Gear Reduction

Compactness is important with engine swaps or long-tube headers. The first Chrysler gear reduction starters used offset gears that added width. The advantage of late-model PMGR starters is the planetary gear-reduction system that multiplies torque while being entirely in line with the armature shaft. Planetary gear multiplication (similar to gear reduction in automatic transmissions) produces a major torque increase within a very small envelope.