i currently have 5" long shackles on my truck in the rear. does anyone know if 4" shackles will work?

there is a slight rake to my truck and i am trying to level out.

front axle is a 4" drop with posie springs
rear is a 1989 camaro axle with posie super slider springs and 4" block

currently i only have the cab, doors, and bed box on the frame. i will be ordering rear fenders after this weekend and wood kit is a while before i install.


all I wanted was a pepsi