rear window retention at high speed

[72Pstroke]

Hello, all.
I have a '69 Mustang fastback I have been playing with some. I have run a couple of half mile events, and in May I will run my first mile event.
The car runs mid 140's in the half, and I am expecting it to run in the 170's in the mile.
The one thing I am worried about is the low pressure at the back window sucking the back glass out of the car.
Am I right to worry about it, or am I wasting my time?
The window is held in place with the rubber seal, which was replaced after the car was painted.
I don't want to drill the body for retaining straps.



I sure would like to hear from someone that has ran a similar car at these speeds.
Thanks for input or ideas.
Tim

[raustinss]

I would guess you'll be fine as is . Possibly over 200 id be concerned

[72Pstroke]

I would guess you'll be fine as is . Possibly over 200 id be concerned

You were correct so far.
I ran 156 in the mile, and hit 164 on the road race.
The window stayed in.