Moved rear end back 1.5

Roccodart440 thanks for the replys, I did use the existing hole in the frame rail but made a new one inline with the stock location but in the frame rail to keep the shackle angle from becoming to excessive, I'm using beefy aftermarket shackles so we did have to modify the area where the stock cross mount at the rear is, so just using the stock mounting points will be okay? That's a huge relief. I was worried about mounting the shocks in front of the axle because of possible interference with a sway bar. I'm running a ford 9 inch and a fuel cell so clearence at the rear isn't so much of an issue. Thanks.