[COBALT]

The frames are thicker, the trailing arms are reinforced with plates top and bottom (but can be used), coils are heavier, the lower ball joints are heavier (so the lower control arms are different), and of course the good ole 8 lug axle and spindles.

One of my projects is to convert my LWB 3/4 '69 C20 to 1/2 ton suspension (for either 5 or 6 lug pattern). I'm going to have to get a different rear-end (coil sprung), different spindles, different lower ball joints, different lower control arms.

There may be other issues too. The pitman arm, and idler might be different (you'll have to confirm that). For the most part you can use most of the rear suspension as is, but the axle is obviously a problem.