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Difference between jh6 and jh7, mounting, rotor diameter, anything that could help me. Changing from srw to drw axle, thanks
 

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Here's a little info.

BRAKE HYD POWER, 4 WHL DISC, 9,900 LBS BRK HYD PWR DISC(JH6)


I believe that GMUPFITTER.COM has all the RPO's available, year by year.
 
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