Lower Sliding Door Rail: Description and Operation

Fig.13 Rack Access Hole Locations:

LOWER DRIVE UNIT TRACK & RACK
Vehicles equipped with a power sliding side door utilize a lower drive unit track or door track and rack assembly. This track provides a mating rack gear for the lower drive unit to engage. The track also accepts the lower hinge rollers, which helps support the weight of the side door as well as providing a smooth surface for the hinge rollers to move upon.

The lower door track is a replaceable component. Consult your Mopar parts catalog for specific part numbers.

With the start of a power door open cycle, the door motor drives the flex drive assembly. The flex drive assembly drives the lower drive unit. A metal drive gear which is part of the lower drive unit, meshes with the door track rack teeth and moves the door into the full open position. The same operation repeats itself, during a power close cycle only the system rotates in the opposite direction.