if i put the front spring in the rear do i need 2" or 3" spacers for the front????

 

I'm not sure if the front springs will fit the rear but its not a good idea,The fronts will have a higher spring rate so using them in the rear will make it ride rougher.See if you can find rear spacers local cheap enough.

 

What he said. It can be done but will affect the ride quality of your rig.

 

Some kits that are sold use the front springs in the rear for 3.5 inches of lift in the rear. They will fit, but the ride will be a little stiffer.