I decided to put my 'new' window motor in since I already had the door panel off anyway. It as not that difficult, took 1 hr 15 min, total. Results: 4 seonds down, 5 seconds up, cutting 1 sec off both directions!
First, the 'new' motor is a used motor from eBay, $40 or $50, not worth it considering the cost to do the Aerostar motors from a salvage yard, but a lot easier, and I don't have a grinding wheel with stand in my garage. So, a bolt on job, I'll chalk up to experience and tinkering. It does shave some time off, maybe a 'real' new motor would work even better. I was more hopeful, because when I spun the shaft of the old vs. 'new' there was a lot more resistance from the magnets and shaft, i.e., the 'new' motor jerked alot more, where the old motor spun more freely. And it did work a little better. Good enough for a long while, Aerostar motors are now way down the list of projects.
Second, a few tips for removal/installation of the Regulator.
1) The screw at the long arm (12" +/-) and the short arm (4" +/1) is not gonna come off and doesn't need to.
2) I used a thin rope, clothes line rope, to hold the window in the up position, Tied from the rear view mirro, through the cat whisker, under the window, over the top of the window, back down through the cat whiskers, through the door frame, and tied to the door lock. Perfect, can raise or lower easily.
3) Mark the wires connected to the motor "Top" and "Bottom" remove wires. Remove the 4 bolts holding the Regulator assy in place. Remove the top bolt holding the Guide bar and the bottom one under the door, and slide this bar out with the Regulator still in the door.
4) Fold the assy that attaches to the window back under to the shortest length, closest to the Regulator, after removing the window screws, and window from assy.
5) Slide it all out by through the longest opening by the rear of door jam, bottom right. No sweat, but no paint to worry about scatching, which was good, scatched some tar off.
6) Regulator motor is easy to take off, you'll see. Check your nylon gear while your this deep in enemy territory. Get the Brass Gears if there are any stress fractures radiating from the middle shaft.
7) If you get the motor in 180 degrees wrong, no worries, I did that, no clearance problems, so don't have to do it again.
8) Almost everything is 10mm, I like that.
Feel better that I did this, could do it again in 45 min., after door panel is removed. Not so bad after all. No major tools needed.
