GBar Ride Height Adjustment VS pinion Angle

[nicks67camaro]

I have a 1st gen camaro Gbar. In addition to my 6 speed upgrade I decided to move the ride height up a little. I now a have a very bad vibration @ 65 -70 MPH that gets worse with speed. I know my drive shaft is balanced and the car with the old ride height and transmission was smooth at high speeds. Besides going from a T10 to a T56, The only adjustment I made was to the lower shock mount. I moved the mount up one location on the axle plate. Would that be enough to drastically change my pinion angle and create a bad vibration? Should I be looking at my Trans and crossmember location?

Thanks