I have removed my blocks and added a shackel flip. Now my 14 bolt is straight inline with the driveline. I drove it back to my shop and got a bit of vibe from the rear now at about 35 and it was getting worse with speed. I dropped the case 1" with the factory spacers and haven't had time to drive it yet. But my question is what is the optimum angle for the rear pinion. I thing it should be parralel with the trans output but not sure. What is the best way to figure the degree shim needed? I know it is trial and error, but I would like to get close on the first try ;-) Thanks guys. P.S. Got new pics up on the webshot page that show the shackel flip install and the new driveline angle in reference to the shaft and pinion.