Quote:
Originally Posted by Jeepwm69
I was attempting to interpret how the calipers are listed.
ACDELCO 18R640 {#18035829} Professional; Non-Coated, Includes: Semi-Metallic Pads and Hardware; Reman. Info
FitsFront Left; with 11-5/32in x 2-3/4in Brakes
OrFront Left; Heavy Duty System; w/ 11" X 2" Brakes
ACDELCO 18R639 {#18035828} Professional; Non-Coated, Includes: Semi-Metallic Pads and Hardware; Reman. Info
FitsFront Right; with 11-5/32in x 2-3/4in Brakes
OrFront Right; Heavy Duty System; w/ 11" X 2" Brakes
ACDELCO 18R623 {#18035812, 18R737} Professional; Non-Coated, Includes: Semi-Metallic Pads and Hardware; Reman. Info One of our most popular parts
Front Right; Standard System; w/ 11" X 2" Brakes
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The 11x2-3/4 and 11x2 refers to the rear brake shoe size on those vehicles.
Go out to your truck and measure your rotor width first.
Per RockAuto,...
It looks like 18FR623 and 18FR624 are for the light duty 1" rotors.
And 18FR639 and 18FR640 are for the HD 1-1/4" rotors.