Here’s the door on our 1966 Mustang fastback. If your early Mustang has the standard door panel instead of the Pony style, you’ll also need to remove the armrest because it’s not built into the panel.
Both the window crank and the latch release lever can be removed with the same-sized Allen wrench.
Gently pop the panel from the door. Be careful not to pull the retaining clips off of the panel backing, which is made of cardboard.
With the window glass in the raised position, clamp a pair of locking pliers on the window actuation arms to prevent the window glass from falling down into the door when the regulator is removed.
Remove the four regulator retaining bolts from the door shell.
The small wire-retaining clip located at the end of the regulator arm looks like this. This clip is the only thing left to remove before the regulator assembly comes free of the door. Use a small amount of lubricant, such as WD-40, to loosen things up, and pull on the clip with a small, flat-blade screwdriver.
Here, the regulator assembly comes out of the door. At this point, inspect the rollers on the window mechanism. These rollers travel inside the tracks that control window movement. If they’re damaged or missing, you can get new replacements from Larry’s Thunderbird and Mustang Parts.
Install the new regulator unit into the door. We recommend making your clip attachment before you bolt the regulator into place.
Attach the new regulator into place with the four regulator retaining bolts. Carefully reinstall your trim panel, window crank, and door release handle. That’s all there is to it.
It’s a good bet that Ford didn’t foresee the 1965-66 Mustangs being in service for 35-plus years. And, over the course of those 35 years, how many times have those driver-side windows been up and down? If your car is like ours, it’s been used every day since new. If the window was operated only one cycle per day, then that’s 25,550 times the regulator has been used. No wonder our window has been acting a little cranky. Actually, the window on the driver side wasn’t working at all. The passenger side was a little better, though the cranking effort was far from acceptable. The good news is that it’s easier to repair window operation than you might think.
We were getting to the point where we couldn't pay our tolls without opening the door, so when the good folks at Larry's Thunderbird and Mustang Parts offered to come to our rescue, we were more than grateful. Larry's is a great one-stop source for all of your Mustang and T-bird parts needs. Give them a call, because what you're after is sure to be in stock and ready to go. Installation of the regulators is easy. Once installed, the windows operated like new, with minimal cranking effort and a nice, smooth operation.