Inadvertently exceeded driveshaft "Critical Speed" at Willow Springs.

Had my Monti SS with stock 200R4 up to 130 ish lots. Cruise 110 all day long. Smooth as glass. Will have to put my drive line protractor on it to see the stock angles. One of the most important things in building a car is drive line angle. Jbc426, you said in another thread that US car tool was going to make a trans mount that was lower. Would like to know what you get now with a protractor. If it's not optimal, I'll build my own. Not wanting to cut up a finished product. That pan looks REALLY low too. What's the ground clearance for it now ?