Beautiful car. I am baffled why the driveshaft came apart before the 7.5" rear end. You mention 31-spline axels, and using a carrier from a 7.625 F-body - did you mean 28-spline? You have me looking sideways at the shortened stock driveshaft (new u-joints) in my 5.3L/4L60e Monte Carlo.
When you find what is vibrating, it will be obvious.
When you find what is vibrating, it will be obvious.
