I don't know what angle my engine sits at but it's not level. I noted in some Chevrolet manual or other not to shim the front motor mount between the mount and the frame. That statement assumes changing the engine angle was a common enough practice. Last time I pulled the engine on mine I found assorted front-end shim embedded in the grease on the cross member.There were marks worn in the frame where the shims had been. Rather than shim the engine when I last had to deal with U-joints, I shimmed the auxiliary trans to get the u-joint angles I needed. Spicer publishes a booklet detailing how to accommodate tandem axles, auxiliary transmissions, pumps, winches, power take offs, etc. I got mine free from the driveline shop I deal with. Lots of shimming going on. If the OP doesn't get the pinion set exactly right when all is loaded, said and done, there are tapered shims to the rescue. I have several left from some project or other and they are marked 3 degrees. They are intended to go between an axle and spring perch. These are also used to set caster on beam front axles.
