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For what you're doing, I think you just need upper control arms, spindles, and brakes. The lower control arms I believe are the same. GM added ABS tone rings on the front rotors in the later years. I attached pages from the parts book.
It's a good idea to measure the spindle for wear when you're looking for these.
The only differences I've noticed so far on the 8600 frames (regular cab long beds) aside from the actual suspension components are:
1) The front fuel tank support (one style is visible in the gap between the cab and the bed and has a carrier bearing bolted to it and can't find replacements for these, the other one bolts in the same holes on the frame but is swept back slightly under the truck bed, Dorman makes a replacement for these)
2) The rear leaf spring mounts are different. The 8600 8-lug 3/4 ton uses the 4WD rear leaf spring mount and has a second bracket that is a 90 degree support from the spring bolt hole on the back side of the mount to the frame.
It's a good idea to measure the spindle for wear when you're looking for these.
The only differences I've noticed so far on the 8600 frames (regular cab long beds) aside from the actual suspension components are:
1) The front fuel tank support (one style is visible in the gap between the cab and the bed and has a carrier bearing bolted to it and can't find replacements for these, the other one bolts in the same holes on the frame but is swept back slightly under the truck bed, Dorman makes a replacement for these)
2) The rear leaf spring mounts are different. The 8600 8-lug 3/4 ton uses the 4WD rear leaf spring mount and has a second bracket that is a 90 degree support from the spring bolt hole on the back side of the mount to the frame.
Rear Leaf Spring - Rear Hanger - '89 C2500 8,600 GVW
Just came across this and wanted to share. I'll lead with: Dorman 722-008 is the correct rear leaf spring rear hanger for an '89 C2500 8,600 GVW Wanted to lower the rear to level it out a bit before adding Air Lift load leveler bags. I originally ordered the Dorman 722-007 hanger but it is...
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