Fly GLASS/Window QUESTION ??? '73-91 ???

[67Cowboy]

I have a '76 GMC 3500 that the passenger side flyglass was broken out of, so I called up a buddy that is parting out 4 of the 73-87 pickups and blazers and he brought me a complete glass in the frame, spring, lock...
Any way I spent an hour today cleaning out the clear tape I had plugged the hole with and got the glass out of his old rusty frame; BUT IT DON'T FIT !!!!!!
IS THERE A DIFFERENCE IN FLY WINDOWS BETWEEN 73-87 AND UP TO 91 1 TONS AND SUBURBANS ?!?!?!?!?

[Slonaker]

The only difference I know of is that the 70s models have one less screw holding them in at the top of the door. I have a 70s model in my '86 because it was what was available the day I went to the junkyard. I replaced the whole assembly, not just the glass, so I don't know if the glass parts are interchangeable.

LMC Truck, on page 15 of their catalog, shows different part numbers for replacement glass, but says the assemblies are interchangeable. If the glass doesn't fit, maybe you can put the glass back in and use the whole assembly?

Slonaker

[Jonboy]

The assembly IS interchangeable, but the glass is not. There are at least two different glasses, but I think it's three. The glass from a 77 will not fit in an 87 frame. The 87 glass is rounded off at the top, while the 77 glass goes straight up to the point. I am pretty sure the gasket was redesigned sometime after 87 or 88 in the Suburbans/ Blazers.