Actually your gears are not likely to be stripped. Go to Autozone, Advance, or your local parts store look in their Help section there are the parts to repair the gears.Its a common problem on all Fords.The required parts are CHEAP.All the repair requires is you remove the motor[gotta do that any way], remove one screw, take the gear apart, clean up the broken parts, replace the 3 clutch dogs [plastic plugs],grease and reassemble. Less than $10.00 a side.Anyone who works on our cars [or any Ford with power windows] should learn to do this. If you have any questions there are threads that address this issue. Feel free to pm me with any questions.