front brake rotors 82 gmc stepside
 

i went to purchase the brake rotors for my 82 stepside and they asked if I had 2 inch or 2 1/4 inch brakes can anyone tell me how I determine the difference so I get the correct ones for my truck?

Re: front brake rotors 82 gmc stepside
 

Your rotor thickness should be 1in or 1.25in thick.
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Re: front brake rotors 82 gmc stepside
 

J50 is the merchandised (customer selectable) RPO for power brakes; JB3 and JB5 are subsets (additional detail) based on that. JB3 is the small 1" rotor; JB5 is the 1.25" rotor.

Here is the brake system release chart (for a '74, and for an '87) for reference if you would like to review it for a bit more detail.

K



http://i1016.photobucket.com/albums/...ase74-1001.jpg

http://i1016.photobucket.com/albums/...ase74-3001.jpg

http://i1016.photobucket.com/albums/...ase87-1001.jpg

Re: front brake rotors 82 gmc stepside
 

Measure the rotor thickness and have them match it, if the parts guy is willing.
2 or 2-1/4, I believe is the width of the rear shoes. They can use their computer to determine what you have by that.