[Lynn]

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"The 68 Z that William referenced in the Car & Driver road test comparo had a service package rear."

I beg to differ. I have under car photos of it showing parking brake cables. The OTC conversion did not use a parking brake.

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William:

First, post some pictures of that car! I would love to see them. Second, you are correct in that it would have been a true JL8 set up, complete with the little drum type park brakes and cables, but I still believe it was only available over the counter in 68. It was an RPO for 69, but the rear axle is the same as what what sold over the counter for the 68's which, if equipped with disc brakes, would already have the four piston calipers in front.

I shouldn't have used the term "service package rear" as that has come to mean the different over the counter rear end sold in 69. So the "service" rear in 68 became the RPO JL8 in 69 and a slightly different unit became the "service" package rear in 69.

According to Colvin, speaking of the RPO JL8, "This rear axle assembly was available through Chevrolet service in 1968, but few people other than factory supported race teams knew of the option."

As usual, I could be wrong. Anyone seen a documented 68 equipped with JL8 from the factory?

Sorry for any confusion.

Lynn