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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
The best way is to measure.
I had an '86 with the HD rotors and an '83 with the light duty rotors.
I'm not sure what GM was thinking.
I know all the 71-72 front ends are 1-1/4".
I think all the 73-80 front ends are also 1-1/4".
81-87 is anybody's guess,...
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