Pulled off the driveshaft in search of the continuing vibration, after swapping out the axle bearings it is significantly reduced but still present. Stopped at NAPA and picked up 2 heavy duty Precision 280 U-Joints to install. Pinion flange requires a 12 point 12 mm wrench to remove the four driveshaft bolts. Used the "big socket, little socket" trick to remove the caps and a bench vise to press the new ones in. Re-installed the driveshaft (don't forget the loctite on the flange bolts) and fired it up. Significant improvement in performance and reduction in vibration.
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