Pinion angle and driveshaft length.

younggun2.0 said

i wasnt accounting for the axel wrap.

if we are using the sinerio of the superstock springs that cracked mention then the pinion would be down 3* to be at zero.

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That depends how you set the SS springs up, if you even set them up at all which most do not modify them at all so even then 3 will also be off, unless you have \6 power.
If you just bolt them in and go then if the trans is at a 2dg slope and not corrected you may need (dependent on power) 5,6 or 7 at the diff.
You don't want angles though