Springs on the 3/4 and 1 ton trucks are three inches wide. Only 2.5 inches on the half-ton trucks. If you want the 80 under your half ton, you will have to change the spring mounts as well.

 

I know this, I have already taken measurements and researched to see if the perches will mount up, that is why i will be removing the axle with springs and spring perches and refasten it to the 1500 frame with Grade 10 hardware