How To Replace '87 - '93 Hatchbacks Mustang Quarter Rear Windows

Before installation begins, surfaces are outlined with masking tape to protect the paint.

There are a couple of choices when it comes to window sealer. The Custom Shop is using R-900 windshield sealer from ADCO Products, available from most auto body supply stores. R-900 is a permanently flexible sealer that expands and contracts with temperature changes for a leak-proof joint. You can also use 3M Windo-Weld Resealant (No. 08634), which is more like glue and less like a sealant, or 3M Fast 'n Firm sealer (No. 08505). Apply sealer at contact points around the window.

The window assembly is firmly pressed into place for the initial set.

The glass shop that removed our original quarter windows managed to lose the Ford fasteners. Our local Ford dealer did not have the fasteners. A visit to a True Value Hardware store netted the 18 fine-thread metric nuts and flat washers. Ideally, you will use Ford fasteners, which are typically tinnerman's nuts with blended washers.

With a helper pressing on the glass from the outside, thread each nut until snug.

The Custom Shop discourages the use of a ratchet when tightening these fasteners because overtightening can accidentally break the glass. Tightening should be done in a criss-cross fashion and just snug enough that the window is firmly seated.

Reinstall the quarter trim panels, taking care not to overtighten the fasteners, a combination of pop-in fasteners and screws.