I installed an ORD 3" lift kit on my m1009.
Identical to a 1986 K5 Blazer.
Front Tuff Country HD springs for 3" lift.
Rear Shackle flip for 4" lift.
Here is some testing video i made.
In the notes i have some info regarding driveshaft and pinion angles after shackle flip.
I looked a lot of...