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Normally, a true 4 degree negative pinion angle is the maximum I recommend. This is relative to the transmission center-line, not to the driveshaft or the ground.

I like to see 2 degrees negative for a street car.

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If the transmission slopes downward 5 degrees toward the rear, the pinion should slope upward 2 degrees toward the front.

This is referred to as 3 degree negative pinion angle. I consider 4 degree negative to be the maximum for a true street car.
thank you doctor diff....thats what i am going to do.....i will report back when i am done with the test drive.....3 degrees negative pinion angle