Drive line Vibration

I'll check it out. Ordered the axle shims. Thanks!
Excellent idea! Will do! Thanks!
Plunge depth distance is WAY off. Yoke barrel is visibly too exposed. Appeared odd from the start. Measured about 2 inches from end of tail housing. (Seal is not the black extended type.) Way more than the correct 5/8 to 3/4. Possibly some wobbling? My shaft length is 44.88. Specs say 48.88. From each U-joint center.