I can't remember where I've seen it, assembly manual I believe, but the crank should be at about 1 to 2 o'clock with windows closed. This is so that any road movement that would jiggle the mechanism would tend to keep the window closed rather than jiggled it open. This was the case of all GM cars for decades. about 10 Years ago my friend bought a new compact GM (chev or GMC) pick up with crank windows, they were at 1 o'clock in the showroom when he got the car.
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My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
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