Will raising the back of my truck with new shackels affect any systems like the ABS, brakes or handeling? And if I tighten the front t-bars to level off, will this effect anything?

Why would putting the suspension back to normal height effect the ABS?

ABS won't be affected by any ride height change. Unless the front or rear is literally 3 feet different from the other, but I don't see that happening any time soon.

Just get some Add-a-leafs or shackles.