Mine is an 85 model. I am getting ready to gut my tailgate and remove the regulator, motor and glass. My truck is a woods beater with no top, so it is just unwanted weight for me. The motor even has new gears in it ($20 from Ford). I searched on car-part.com for 80-96 models, and got prices from $45-100 for the regulator. I will sell the regulator for $30 + shipping, but will make sure it still works before going any further. If you want the motor, I will through that in for another $20. They are $60 new at Autozone.
Danny