The easiest way to tell is to look at the bottom most bolts that hold the third member in the housing. If you would be able to get a socket on those bolts to loosen them, it's an 8". If the shape of the metal on the third member will only allow you to get an open end wrench on those two bolts, it is a 9".
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1969 fast back; yellow; weld wheels; 302 roller with GT-40 heads; 3:55 gears; 5spd T-5; MSD 6AL; E-303; flows; Hedman headers; Holley 600;Weiand Accelerator;1.6 rockers
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