Re: 1968 Chevelle Rear Wheel Backspacing Question?
The shock mounting isn't the only problem. You can run into the inner wheel tub on bumps if you're car is lowered because the clearance isn't exactly vertical and there is less clearance in the upper portion. I have 5.5" backspacing and occasionally rub on the inner tub with 275/60s. My wheels are 9" wide and also very close to the outer lip. I can just about fit one of my sausage fingers in there. I don't rub on the outer lip, though, just the inner. My car is lowered 2" in the rear. I have new and stiff poly bushings in UMI lower control arms and Edelbrock adjustable uppers that won't deflect like stock arms with rubber bushings. I think if I had stock bits it would rub every which direction on off-camber bumps.
69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt
76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt