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« on: May 02, 2013, 08:27:43 PM »
From Untold Secrets
OPTIONS WITHIN OPTIONS...
Until the introduction of the 1969 model, Camaro owners were limited to upgrading their brake systems by using the Heavy Duty Service Package. Things changed dramatically with advent of the 1969 Camaro and the introduction of the RPO JL8 four wheel disc brake package. The Camaro owner now had the option to order his 1969 Camaro with four wheel disc brakes (RPO JL8) installed at the factory or with base equipment and later upgrade to four wheel disc brakes using the HD Service Package.
Shown below is the "basic" HD service package disc brake rear axle housing assembly. Note the Corvette caliper adapter/park brake assembly's...
Taking it a step further... If he ordered the optional JL8 equipment on his 1969 Camaro, he then had the additional option to further upgrade the system by substituting the heavy duty rear axle from the previously released HD Service Package in place of the JL8 rear axle. The advantage in this being; the HD Service Package axle uses larger diameter axle shafts and bearings which significantly improve durability, a factor especially important in racing. Anyway you went, it was a win-win situation with this limited production performance equipment.