83 300SD – Rear driver side power window was only working partially. Would move up some but wouldn’t go down. Here is what I found.



(LEFT) The broken white plastic parts and black tubes go on the end arm of the regulator and slide in the track for up/down window movement. The sleeve that the hole in the white plastic goes on has a collar. Can’t just buy a new plastic track runner because the collar prevents it sliding on. Doubt you can buy just that part – probably want you to buy a whole regulator assy for $250. Maybe epoxy the part and let it dry on the sleeve – doubt it would hold. You could probably drill out the rivet holding the sleeve/collar and fashion something.

(RIGHT) The greased black rubber chunk is what I cut out and drilled a hole to replace the white plastic unit. Took 3 tries – kept making the hole too big and regulator sleeve kept popping out. The hole that worked was ˝ the size of the collar – took some pressure to get it on.



Black rubber chunk on the regulator sleeve inside the track. Greased real good. 20 up/down repetitions and it works fine. Time will tell.