shackle lift questions

[neo71665]

I need the measurement center to center of the 2 holes on a first gen shackle with a 2 inch lift. Gonna make me some and don't wanna go the trial and error route.

[Barry James]

If you make them 9 1/4" long and 7 1/4'' from center to center you will get between 1.5"-2" of lift in the back.
It depends on what shape your leafsprings are in so I can't tell you exactly the amount of lift you will get, it will be between 1.5"-2" of lift.

If you make the shackles longer then 9 1/4" you will have to re-shim the rear axel to correct the pinon angle.

[neo71665]

Thanks, I knew it wasn't gonna be some exact number for everybody I just wanted a rough idea. I didn't know it was close to 9 that the pinion angle changes. I was just gonna measure the angle before and after lift then fix it.