on my 89 ranger, i drilled three access holes to get to the three hex-head screws holding the regulator to the window gear arm.
it all went flawlessly. i recommend a small c-clamp on the window track to hold the window up.
the regulator releases from the window gear arm without trouble and reattaches just as well. the only steady concern is to get the screws in and the regulator and gear arm fit comfortably. (provided the window is held as far up as possible!)
the regulator has TWO gear teeth.
ONE works with the window gear and the SECOND gear is inside, beneath the first.
THE SECOND GEAR could be shattered.
it is better to to take apart the regulator at the salvage yard and inspect the plastic gears. PULL the gear out. if the bottom gear (second) is broken or even if the top gear (first) is broken, be sure to completely clean out all the old grease to get all the shattered plastic.
it is a safer bet to just purchase the gear than the whole regulator. i paid $5. | 
