'Service Duty' rear ends for '69 Z28? - Team Camaro Tech
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post #1 of 4 (permalink) Old Aug 8th, 08, 12:56 PM Thread Starter
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'Service Duty' rear ends for '69 Z28?

OK.. I'm a new guy here (first day), and it looks like this forum can be pretty helpful, informative, and interesting. I've owned a '69 Z28/RS since 1976, and sometime around 1980 I bought a 'used ' Service Duty rear end from a friend who had raced a '69 Z28 in IMSA for many years. He told me this rear end was much stronger than the factory rear end as it used axles and axle housings as beefy as the full size 12 bolts of that year, but all sized for the Camaro. The axles are very FAT at the outboard ends, and use larger bearings, but taper down at the splined end. Of course this rear end came with heavy duty brakes, and did not incorporate an emergency brake mechanism since it was for 'racing only'. I've never installed this rear end in my car, but would like to get more information about it, and if installing it is a good thing to do. Can anyone shed any more light on this subject?

Thanks in advance,


I'm attaching a couple of pix of my original 69 Z28/RS here:
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post #2 of 4 (permalink) Old Aug 8th, 08, 01:28 PM
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Re: 'Service Duty' rear ends for '69 Z28?

Sounds like the JL8/HD axles discussed here:


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post #3 of 4 (permalink) Old Aug 8th, 08, 02:24 PM Thread Starter
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Re: 'Service Duty' rear ends for '69 Z28?

Thanks for the reply and the welcome Eric, and although that article tells a *lot* of the story, I don't think it is 'complete'... As I understood from my friends, the 'service duty' third member was almost totally different from the standard JL8 RPO. The housing, bearings, axles, and brakes were different (heavier and stronger). My understanding was that the 'service duty' rear end could not implement a standard emergency brake as could the JL8 package... Maybe I was told wrong (although both guys who told me the story ordered NEW Z28's in '69 (one with JL8 and the other with standard rear, but he installed the service duty rear end) and both raced in SCCA and IMSA GT for several years with those cars. They drove them from the dealership where they picked them up, directly to their shop where they began stripping off unnecessary parts to convert the cars to IMSA GT cars. I have some of the parts removed at that time! And I have the service duty rear end that Bob Christianson had installed in his '69 Z28 (RACE enterprises car). I have two sets of axles for that rear, one with quick change studs and the other with standard studs. One reason Bob quit running those rear ends, was that the service duty axles became 'unavailable' from GM! That is most of what I recall from what I gleaned from Bob 30 yrs ago... but I have little documentation backup for any of that, although I DO have a copy of his original 'Chevrolet Race Prep' manual, mostly handwritten by GM engineers in how to setup and race Camaro's and Corvettes for road racing! This was the original precursor to the later mass produced manual which Chey sold in their parts stores! I'd love for anyone having additional information about the service duty disk brake rears to post it here.. If there's any interest, I'll drag out the one I have and make some photos....
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post #4 of 4 (permalink) Old Aug 8th, 08, 02:54 PM
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Re: 'Service Duty' rear ends for '69 Z28?

Gary, welcome to Team Camaro. This section is for introducing yourself to us, which you did but you will get more replies by posting your specific questions in the appropriate sections. This one probably in Tranny and Rear End section. Welcome aboard.

Click..is Jim..former owner of a 69RS-LM1 350/255 - 700r
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That will be the beginning." Louis L'Amour
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