Rear Pinion Angle/measurements when doing fullwidth conversion

[Dachy]

For those of you who have done the full width conversion what pinion angle did you go with, how far apart are the spring perches (center to center) and what reference points on the axle did you use to measure?

I have a 5.5" Suspension lift, low-pinion rear 9 inch out of a 79 f-150. I already have an extended drive shaft from wild horses that comes with their system 12 lift kit and the stock dana 20.

Initially I was going to point the pinion yoke right at the transfer case yoke and then make it about 2 inches below that to compensate for the pinion 'kicking up.' I have read that the pinion angle should never be more than 9° according to some companies (because it'll starve some bearing of oil and make your pinion blow up), while others say it can be up to 18°. I figure 9° is the safe bet. What do you guys suggest and has anyone done this with the same lift and axle as me?

 

[bronko69er]

Here's how I did it:
Grind off the old perches.
Reintall the axle with the perches in place but not welded (u-bolts snug but not tight).
Measure from each leaf to backing plate and adjust until distance is equal on both sides.
Rotate axle until pinion points to just under the t-case (exact is not important).
Attach driveline.
Take off of the jack stands and put the weight back on the axle.
Jack up pinion (rotating the axle) untill the pinion angle is about 2 degrees (if using a CV) less than the driveline angle .
Use one of these.
Weld perched in place (remove u-bolts if necessary.
Thats it.