I have never done a ranger,but I have done both a Mustang and F-150 from the same time frame. Both were the same, so I would bet the ranger is as well.The motor has a nylon gear on it. You can replace the gear if the motor still works. You can get the gear from Autozone for about $25. If the motor is bad, you can replace it with a used or new unit.
To remove the window motor: remove the door panel. The motor will come out through one of the holes in the door frame. It is held in place by 3-4 aluminum rivets. Grind the heads off or cut them off with a chisel. Then just a couple more small bolts and a wiring plug. When you replace it use bolts instead of rivets. Install the bolts with the heads on the inside of the door, so they don't hit the window. Then you will need to cut off the excess bolt and use a thin nut so the door panel will go back in place.
David Cole
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557 BBF Powered, alcohol injected rear engine dragster. 4.88 @ 143 1/8 mile. 1.09 60'. I've got to be crazy to drive this thing.
SC/ET #2729