This is my 1986 C20
Yup a 3/4 ton
C20 and C30 share the same balljoints so drop center wheels on the front is as easy as a spindle change
depends on what kind of brakes...
if your 1 ton has the HD brakes you have to swap spindles
if your 1 ton parts truck has the std duty brakes it will have the same calipers and rotor thickness as the 3/4 ton setup. most likely simply swapping hubs and rotors.
I had the HD brakes which are about 1/4" thicker on the rotor and use the 1 ton chevy-international large front calipers...the ones that look like 1 ton ford calipers which are held on with a wedge instead of 2 bolts
On the rear my rear axle is from an early 90's 1 ton dually
I had to relocate the spring pads since 1 tons hold the springs in closer to the frame where the 3/4 ton shares a similar spring track as the half ton= frame hangars stick out farther with more space between the spring and frame
So im running the wider srping pad setting to bolt into a 3/4 ton with zero tie interferance issues. they arn't even close
and the shock mounting is different
When I reloacted my shock hangars I also shortened them up a little so the shocks dont hang down so far
Word of advice...if you eyeball their clocking position on the axle tube make sure you have a little space between the shock and axle. i got mine turned foreward a little somehow and the shock hit the axle before I could get the bolt it
wa WAAAA wa
As far as the pinion angle on the rear axle they looked close when I compared axles so I took a chance and just strapped my axle to the sawhorses with the spring pads level and moved them outboard without changing the angle.
I've never checked it but I have no vibration and prolly 20k -30k miles on that U joint with no issues.
the factory chevy dually fenders with the little steel thingy to cap off wher eyou have to cut into the sheetmetal...
they will bolt right onto a suburban perfectly
there are a couple runnign around Omaha/Council bluffs I've seen and they look factory