pinion angle

I was sitting on my stool looking in at the rear end with the tire off and it hit me. I think my rear end is sitting up too high. I drove a semi all my life and know a little about pinion angles and vibrations. I would guess the pinion should be pointing down a little so when it is under a load it would be up almost level. I would say this pinion is about an inch or so higher than level just sitting. I dont have any guages or tools to measure this but I would guess this is not right. could someone give me their input on this. Thanks,Bill