Shackle placement and length

[Canadianmoose bogger]

Hi guys am new to this web sight and joined it because of the thread I seen on home made lift. I currently am building a sub frame lowering leaf spring mounts on my 79 blazer. I an also relocating the front shackle to the front of my blazer. My big question is how do you calculate where the front mount should be as i have seen they are never strait at each other and how long should my shackles be. I will also be running longer leaf springs and possible moving my front axle forward.This is my first big strictly off road truck. All others have been street legal and i installed manufactured lifts running 33- 37s I was wondering what gears you would run. It will be a trail rig and mud racer. I am running stock 350 welded Dana 60 and welded 14 bolt I am running 42 inch fire stone vtreads that are 11 inches wide. There max spread is 55 mph. So any advice any one can give me would help. Thanks guys
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