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106436 Posts in 12407 Topics by 4785 Members
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1576  Model Specific Discussions / Trans-Am Camaros / Re: Heavy duty GM 12-bolt axles on: May 03, 2013, 11:04:52 PM
Thanks Jon!

1577  Camaro Research Group Discussion / Originality / Re: 0 rocker arms BIG or small 0 ? differences? on: May 03, 2013, 11:28:19 AM
I've had 030 over 302's.. that would wind above 10,000 rpm with stock components... including stock rockers... Smiley
1578  Model Specific Discussions / Trans-Am Camaros / Re: Heavy duty GM 12-bolt axles on: May 03, 2013, 07:40:47 AM
Thanks Robert.
Your memory is the same as mine!  Smiley     I also have a copy of the 'Chevrolet Special Equipment' book - that I was referring to - I copied from the green sheets a friend of mine loaned me in the '70's (Robert Christianson, who also ran a '69  in Trans-Am and later and later a 73 Camaro in IMSA-GT).   My knowledge of the 'service duty' rear mostly goes to information I got from him, and later I purchased one of the rears that was used in his '69 Z28 TA car.
The reason I asked you those questions is because you are knowledgeable, and I was hoping that you could clear up some of the misinformation that is out there.   The 'few lines' in the available books dedicated to the service package rear do not do justice to the differences in that rear end, and seems to be mostly 'speculation' dreamed up by the authors...

Thanks for your informative response to my questions, and I for one would love to know more about the differences between JL8 and Service Package rears.
PS.  I also do not believe one could order a new Camaro for the street and have the factory install a service package rear end, although it's certainly possible (for a few months) to order the JL8 rear and then pay the almost $1000 for the service package (OTC) and pay the dealer to install it..  although that scenario certainly makes no sense!  As I understand it, the service package rears were difficult to get and likely required someone 'close to Chevrolet' to get one promptly for a TA car.  Bob told me he had a relationship with Vince Piggins when he was running that assisted him in getting some of the special parts.
1579  Camaro Research Group Discussion / Originality / Re: 0 rocker arms BIG or small 0 ? differences? on: May 02, 2013, 12:43:45 PM
Just out of curiosity, I have heard it's best to keep the same pivot ball to the same rocker. Are there any exceptions or is it a must to get new pivots? Mine are all mixed up in a box, all look fine with no blueing, cracks, galling or score marks. I'm using roller tip stamped steel 1.5's at the moment and probably will continue using them when I finally pull the 350 and install the 302, but what if I did go back to the 'O' rockers?
It's very easy to run the balls/rockers on a wire or string as you take them off an engine... you can even clean them that way  and they will come off in the correct order as well.. Smiley     I would suggest using a little molybdenum disulfide on the metal/metal wear surfaces on installation; especially with the mismatched ones..  it should help the two rubbing parts develop an 'affinity' for one another pretty quickly.. Smiley
I also keep lifters in order, when the come off a cam I'm going to reuse; just put them in a small box ordered in the correct fashion, and label the box for front and L/R side..  *(and moly works great on lifter/cam wear surfaces as well during breakin..)
1580  Orphans - documentation or VIN-stamped drivetrains - in search of the original cars / 1969 - Orphans / Re: 69 Z 19N687352 Original Block on: May 02, 2013, 12:22:44 PM
I noticed the same thing..  2 months+ after casting before assembly??  when the norm is probably a couple of days?
1581  Camaro Research Group Discussion / Decoding/Numbers / Re: Muncie ID ? on: May 02, 2013, 12:04:14 PM
Thanks Ed,

I cleaned it and opened the side cover; it is apparently an M20 (from the 2 grooves) although I didn't spin it and count turns.  It is NOT an M22.   
I've never ran the transmission, although I've had it since 1971; installed it briefly in a Henry J, but it was only ran once around a short block.   I let a friend use it for a few months back in the late '70's in his 55 Chevy.   All the numbers from the parts seem consistent with '68-'69 Muncie production, although I know I did swap the front case after I purchased it...  so we know the front case came from a April or May '68 Chevelle (Kansas City plant).   All visible characteristics of the trans are consistent with '68-69 Muncie M20/M21.
The ears and gears look good, and there is no damage, existing or repaired, to the transmission cases. The Chevelle VIN is stamped on the top of the transmission.  I need Camaro $$ more than I need this trans.  Do you have any idea what it's value would be?   
1582  Model Specific Discussions / Trans-Am Camaros / Re: Heavy duty GM 12-bolt axles on: May 02, 2013, 07:06:25 AM
Hi Robert,
I'm curious why you refer to the 'service duty' axle as 'JL8'?   Do you call it that because that's how a lot of Camaro people today refer to ALL Camaro disk brake rears?    

JL8 is the order/option code for the factory installed rear, but the 'over the counter' piece, I've only ever heard referred to as 'The Service Duty' rear end.
In my mind, only the factory installed rear is truly a 'JL8'.  The Service Duty rear served the same purpose (rear disk brakes) for Trans Am racers, but in a much heavier duty way!   Chevrolet never referred to it as 'JL8' did they?

It would add clarification if we had more distinctive terminology to distinguish the two?  There were other differences between the two rears than just the bearing size and axle diameters.   The posi unit in the Service Duty rear had more plates and heavier duty springs also, and there are probably other differences I don't know of as well.

Does anyone have written documentation for, or know the PN, that the Service Duty rear end (brake to brake) was sold as??  I can't find my copy of the 'original' Power Book; does that identify the rear by part number? or by ??
1583  Camaro Research Group Discussion / Originality / Re: 69 Z28 Carb accel linkage and vacuum hardline? on: May 01, 2013, 08:29:27 AM
Can't you just bend it where you want it to be?
1584  Camaro Research Group Discussion / Originality / Re: 69 Z28 Carb accel linkage and vacuum hardline? on: May 01, 2013, 07:51:09 AM
I'm not sure on how such tubes are measured (ID or OD?).. it's a small tube.
From the photograph I sent, it appears the OD is ~ 3/16" (definitely less than 1/4)..
1585  Camaro Research Group Discussion / Originality / Re: Was the nose bolted together when the stripe applied? on: April 29, 2013, 09:44:08 PM
If you compare your Camaro to a model A....  the camaro will look great.. Smiley
1586  Camaro Research Group Discussion / Maintenance / Re: 69 302 motor sitting to long on: April 29, 2013, 02:03:28 PM
I agree with JohnZ...   but besides oil, also make sure you have cooling  and gauges hooked up and working so yuo can monitor engine performance while driving it.. S**
1587  Camaro Research Group Discussion / General Discussion / Willow Run plant about to see the wrecking ball...? on: April 29, 2013, 12:11:57 PM
Interesting article from Hemmings re the Willow Run plant....  maybe we can all pool our money, but it, and convert it to a Camaro restoration facility?  Smiley
1588  Camaro Research Group Discussion / Decoding/Numbers / Re: 69 ralley sport x code ? on: April 29, 2013, 08:58:06 AM
I think he meant 'automatic/ column shift'....    *giving him an extra 'f' to use next time'..  *G*
1589  Camaro Research Group Discussion / Originality / Re: Battery Side post or top question on: April 28, 2013, 08:35:16 PM
It was probably much more likely on a 'customer ordered' car.  I've special ordered a few new cars in the past ('70 RR, '73 RR, '77 MC, etc), and each time I did I always ordered *every* HD option they had, which usually included 'HD Cooling', HD battery, HD suspension, etc.    The key was that when it was specified on the order, the additional cost was minimal!   Typically dealer orders did not specify such things, because customers buying cars off the lot likely believed they were all the same.. and all it did was add to the dealer cost.  Example:   Hemi suspension on my '70 RR was an additional $25, and the 15x7 Rallye wheels were an additional $43.   I don't recall what the HD cooling and HD battery were, but it was typically 10-20 ea...
1590  Camaro Research Group Discussion / Decoding/Numbers / Re: Muncie ID ? on: April 27, 2013, 03:47:50 PM
2 grooves on the input shaft.

Only stamps on the top was a VIN (8K196xxx) and a '4' in a box near the top rear of the front case.
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