i need an axle measurement/pinion angle

in the process of building a new backhalf, and the axle got pushed to the side a little. im trying to realign it but i need a measurement from someone who either knows. or has their bed taken off at the moment..i had the axle center between the frame rails. but now my pinion angle is all wacked out. i know when i go to fix that the axle is going to slightly rotate so what i need is a measurement from the REAR of the 1st stock bedmount (the first mount past the cab) to the center of the axle. and also what should the pinion angle be set at? and where should i set it? im building it on the ground layed out.

Pinion angle is equal/opposite angle of the transmission output shaft,



http://www.carcraft.com/howto/91758/