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If it where mine I would just buy a new regulator for the K5 Blazer. A lot less work and a lot less hit and miss. Even a good used one if cleaned up and properly greased and oiled will last a lifetime if maintained. Good Luck.

Possibly a Suburban regulator. The Suburban gate is a bit taller and that would make up for the down stroke of the glass. Not that I know as a fact. But the top/up height would be the same. The gears would have less teeth and the window would not go down as far. Just tinking from my GM days. 30...

Blazer and Suburban rear glass are NOT the same. Neither are the gates. Completely different. Also there is a mechanical switch at the bottom of the gate that senses the glass being in the down position. That has a spring and is in a plastic clamp. That mechanical switch/lever can get very rusty...

2-3" is not down far enough. They do stick up about 1/2" when down all the way. You have side guide issues or regulator. That rear glass system is an expensive item to replace and over haul. I have used a trim lock item to change the side guides and oil and grease go a long way on the sash...