Slightly Embarrassing Question

Thanks everyone. SSG-yeah that was my initial thought. Two years ago I got that sorted out. It took a couple of shims but it’s right on the money now. Doing that changed the character of the vibration but didn’t eliminate it by any means. Justinp61–you must have been ecstatic when that happened. I put this car together three years ago and it’s all pretty new—crate 408, rebuilt 833 by Brewers, new 7290 slip yoke and driveshaft by Victory, new Detroit locker (489), new 3.55 gears, new axles, new wheels, new tires. I would love to have this resolved!