I know this has been hashed to death, I have ready many posts on the subject as well as online info, but I want to clarify something because I dont want to have issues later. This is for my 47 cadillac which will be a street car with leaf springs, no racing, so I do not think I have to worry about pinion climb issues.<p> I normally set my frame level, set the trans at 3 degrees down, pinion at 3 degrees up, build my engine / trans mounts and am done. Because of the accessory drive system on the engine I am using I cannot get 3 degrees, everything fits nice with the engine 5 degrees down. I do not know yet if I have enough room to shim up the trans to go to 3 degrees but I do not think I do because of clearance in the X frame. So I plan on putting the pinion gear 5 degrees up to match the engine.<p> I have read that ujoints want 3 1/2 degrees max angle, question is that the angle of the engine tilt / pinion angle or is it the working angle? Is the 5 degrees NG or is really ok if my working angle is 0 degrees? (5 degree engine angle +2 degree driveshaft angle = 7 degrees, minus the 5 degree pinion angle +2 degree driveshaft angle = 7 degrees, subtracting them gets 0 degrees). I have seen some pretty steep engine angles in drag cars but what about for the street? 5 degrees is not all that steep but not the 3 degrees I normally can get.