Average pinion angle change w/ shackle flip

[6.2Blazer]

What is the typical pinion angle change after installing a shackle flip?

I did some calculations and with 52" springs and the rear mounting point dropped 8" and came up with about 8-9 degrees, sound about right?

The reason I ask is that I need to do some other mods prior to the flip and want to make sure I'm in the right ballpark for what the pinion angle will be.

 

[redneckdude]

I don't know exact measurements, but it seems about right. I shimmed mine 4º already and need prob 2-4º to get it totally correct without a t-case drop. Shimming helped some wiht mine, but the T-case drop helped that much more...the vibes were almost violent before and now i get them from about 20-30 mph that are barely noticable. Just be prepared to shim afterwards if u have a blazer.

 

[folkenheath]

If you have(or get) a CV rear driveshaft it may work out about perfect without shims.

 

[Stephen]

7 sounds about right. On a K5, it seems to work out right for a CV joint most of the time. for a ujointed shaft, you have to shim and/or relocate perches, t-cases, etc.
Most of the time we recommend a CV joint if you're working with a K5.