How-To: Understand And Maintain Vintage Side Windows
Putting the Stride Back in Your Slide
Better window mechanisms were among the many engineering improvements made for 1969. Inside cumbersome, frustrating window tracks and wing-window assemblies, Ford went to dual tubular window glides, which served both as tracks and single-point adjustments. Instead of a separate sliding idler like we find in '65-'68 models, 1969 saw the incorporation of an integral idler built into the window regulator. For 1969-'70, window operation is simple, with easy adjustments that don't require door-panel removal.
When these windows don't operate properly, the tubular glides are usually to blame. Plastic or nylon bushings in the glides wear out or crumble, causing the window to bind. These glides need a lot of white grease and WD-40 for smooth operation.
One engineering shortcoming for 1969 and early-'70 was glue-in window glass. The glue deteriorates, and the glass comes loose from the brackets tied to the tubular glides. The most popular solution is to switch to the '70 bolt-in windows, which aren't always easy to find these days.
Quarter windows for 1969-'70 aren't much different from ones for 1965-'68. They sit in a track that can be adjusted up and down and in and out at the bottom to control window angle.
An Ever So Subtle Difference
Did you know there are two types of quarter-windows for 1969-'70? For 1969, the quarter-window (left) is glass alone, with the stainless trim attached to the door window glass. Ford improved this design for 1970 (right) with wider stainless trim attached to the quarter-window instead. We tell you about this important detail because it's easy to forget when shopping for window glass.
Ford refined the Mustang's windows dramatically in 1971 by eliminating one of the tubular glides and reducing the number of adjustment points to two. The total number of stops was reduced to three--one at the bottom and two topside. This design became the standard for Ford windows and remains in use today.
Quarter-windows for 1971-'73 remain similar to those for 1969-'70, with an integral idler link and three stops.