Quote:
Originally Posted by Desert1957
My 87 is a "Heavy Half" with 1.25" Rotors.
It has two RPO codes , "JB5" and "J55"
JB5 Brake System: Power, Front Disc, Rear Drum, 6400 Lbs.
JB5 BRAKE POWER, DISC/DRUM, 6,400 LBS
J55 BRAKE SYSTEM HEAVY DUTY
Desert
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Based on this I'm guessing JB3 would be the RPO for the smaller rotor.
K