BlK89EXLB
OBS Enthusiast
Hey everyone I made a upgrade that I could not find much information for and may help someone running into the same issues so mods, please put this where it could be most helpful...
After buying new rotors and discovering my calipers no longer fit I started searching parts to find what happened.
Apparently my '88-93ish K2500 was converted into a dually awhile back by the P.O.
It was originally a 90 K2500 350TBI 8600GVW with the 9.5" 14bolt non floater
All the dually 88-94 K3500s have 1.5" width rotors and 3+" piston caliper. My truck (as do all 88-94 K2500 8600GVWs) has the smaller 1.25" width rotor and 2-5/16" piston caliper. The P.O. simple added the dually hub adapter to the studs and bolted on the wheel. So to my surprise my dually parts did not fit my dually.
After much parts referencing and measuring I found it's a simple upgrade to the larger parts but you have to use the larger pads, rotors, calipers together. the larger caliper and pads will fit over the smaller 1.25" rotor but you will use allot of piston stroke before pad contact is even made and would probably feel like stepping in jello.
All told I spent $250 ($325 w. core charges) to get rotors 1/4" thicker and pads 15% larger and calipers with a 40% bigger piston surface.
There is a difference in brake lines. you can bend the factory K2500 8600GVW lines slightly to clear the CV shaft or buy K3500 DUALLY front brake lines. The larger caliper has a different location that brings the line down farther.
Hopefully this is useful to all of you K2500 guys trying to figure out how to get thicker less warping prone rotors, or any of you trying to convert or dealing with a converted K2500-K3500 dually.
Pics Below.
After buying new rotors and discovering my calipers no longer fit I started searching parts to find what happened.
Apparently my '88-93ish K2500 was converted into a dually awhile back by the P.O.
It was originally a 90 K2500 350TBI 8600GVW with the 9.5" 14bolt non floater
All the dually 88-94 K3500s have 1.5" width rotors and 3+" piston caliper. My truck (as do all 88-94 K2500 8600GVWs) has the smaller 1.25" width rotor and 2-5/16" piston caliper. The P.O. simple added the dually hub adapter to the studs and bolted on the wheel. So to my surprise my dually parts did not fit my dually.
After much parts referencing and measuring I found it's a simple upgrade to the larger parts but you have to use the larger pads, rotors, calipers together. the larger caliper and pads will fit over the smaller 1.25" rotor but you will use allot of piston stroke before pad contact is even made and would probably feel like stepping in jello.
All told I spent $250 ($325 w. core charges) to get rotors 1/4" thicker and pads 15% larger and calipers with a 40% bigger piston surface.
There is a difference in brake lines. you can bend the factory K2500 8600GVW lines slightly to clear the CV shaft or buy K3500 DUALLY front brake lines. The larger caliper has a different location that brings the line down farther.
Hopefully this is useful to all of you K2500 guys trying to figure out how to get thicker less warping prone rotors, or any of you trying to convert or dealing with a converted K2500-K3500 dually.
Pics Below.
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- No weak half ton junk here
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- new K2500 pads next to new K3500 Dually pads
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