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From what I can tell, it looks like the main way of telling is by looking at the caliper and seeing if it has a metal piston or a phenolic piston? Can anyone tell me what a phenolic piston is or another way to tell what axle is in it?

Also there were 2 different rotors for the 4500 and only 1 for the 3500. The difference was "overall height. (2.78", 3.080" and a 3.266")" Where would I measure from? The shoulder to the edge?

Thanks
 

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myn is a 5spd and has a 4500 didnt no if the tranny is what made the difference or not?
 

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It should be a 4500# if you have the Cummins. I understand that the diesel got the heavier diff while the gaspots got the 3500# unless it's an HD. Also, a picture would probably help.

Isn't the D60 the 4500# and the D44 is the 3500#?
 

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^ thats right. I've found its easyer to have the parts stores look up parts for a 1 ton. These trucks are all 1 tons exept for the springs. Saves you the confusion.
 
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