the srw 1 ton piston is 3.15" drw is 3.285" i don't think much gain if any came from the drw pads over srw but they are a bit thicker and designed different.
Thank you for pointing that out, I was not aware.
Oddly, on RockAuto, I find disparities in the specs. I'm looking at 1998 Chevy K3500 pickup, for brake calipers. I see...
CENTRIC 14266021, "Front Right; Dual Rear Wheels"
- specs say 3.386" piston diameter"
RAYBESTOS FRC10183N, "Front Right; With Dual Rear Wheels"
- specs say 3.000" piston diameter
RAYBESTOS FRC4414N "Front Left; with Single Rear Wheels (SRW)"
- specs say 79.9mm (3.15") diameter
I wonder what's up here, as the Raybestos dual rear wheel specs seem amiss. Maybe it's just a database error.
Regardless, for the GMT400 there ARE larger calipers than 3.0" (76.0mm), i.e., 3.15" (80.0mm) and 3.386" (86.0mm)
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