Author Topic: Earliest 3969341 and Latest 3894860 axles  (Read 91208 times)

69Z28-RS

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #180 on: August 15, 2018, 02:05:17 PM »
1970 model Novas are the ONLY 1970 model car that used a rear end that was identical (in dimension, etc) to our '69 Camaros.   The 1970 Nova differentials, was produced in the same plant (EATON? - that produced Camaro differentials I believe).  Of course the 1970 Camaro had a different physical configuration (wider), but the 70 Nova differential was the same as the earlier '69 Camaro differential.  I just checked the 1970 Nova differential listing from Nova resource and it shows the leading 'C' in the code as we believe all '70 models had, BUT...  there was no 3.73 (BU) code used on 1970 Novas!  THIS fact would make the 'transition period' (Aug-Nov'69) 1969 Camaro 3.73 (BU) differentials unique coming out of the EATON plant at that time, as they were destined for extended 1969 Camaro production~   Maybe THAT precipitated the BU axles (for Camaros) to get 're-marked' by peening the 'C' off...??

1970 Nova differential codes

CBA - 2.56 open 10-bolt
CBB - 2.56 posi 10-bolt
CBC - 3.36 open 10-bolt
CBD - 3.36 posi 10-bolt
CBL - 3.07 open 12-bolt
CBM - 3.31 open 12-bolt
CBN - 3.55 open
CBP - 2.73 open 10-bolt
CBR - 3.07 posi 12-bolt
CBS - 3.31 posi 12-bolt
CBT - 3.55 posi
CBW - 4.10 posi 12-bolt
CPA - 3.08 open 10-bolt
CPE - 3.08 posi 10-bolt
CPI - 2.56 open 10-bolt
CPJ - 2.56 posi 10-bolt
CPO - 3.08 open 10-bolt
CPR - 3.08 posi 10-bolt
CPX - 2.73 posi 10-bolt
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

bcmiller

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #181 on: August 15, 2018, 02:21:24 PM »
One big problem with that thinking Gary. There are documented original cars that do not have the C peened out.
« Last Edit: September 14, 2018, 10:36:05 PM by KurtS »
Bryon / 1968 Camaro SS 396 coupe - now 468 cubic inch BBC/M21
67 RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

BULLITT65

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #182 on: August 15, 2018, 02:26:26 PM »
Good theory Gary, but then at some point they just let it go and weren't worried about the C?

That's possible. If only we had some internal  memos from back then explaining the C
1969 garnet red Z/28 46k mile unrestored X77
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bcmiller

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #183 on: August 15, 2018, 02:59:43 PM »
The axles were assembled at Detroit Gear and Axle. I have tried for years to find a contact, just like I have tried to find a contact for Fisher Body at Norwood. No luck so far.
Eaton made the posi units, they did not assemble axles.
« Last Edit: September 14, 2018, 10:37:36 PM by KurtS »
Bryon / 1968 Camaro SS 396 coupe - now 468 cubic inch BBC/M21
67 RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

69Z28-RS

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #184 on: August 15, 2018, 03:14:40 PM »
PS.  There are SEVERAL differences in the Late production cars which are NOT documented accurately; I'd like to see us work to resolve some of those items... another for instance:  the Z28 valve covers and the drippers that the late cars got (the ones that haven't been changed out due to the INACCURATE information posted about '69 Camaros in general)... 
« Last Edit: September 14, 2018, 10:38:49 PM by KurtS »
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

bcmiller

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #185 on: August 17, 2018, 01:53:39 AM »
I'm going by YOUR database (or OUR database) on the posted photos re this topic here on this site...  They ALL appear to have been peened with the same type tool...

WRONG.  See attached. 

It doesn't really matter why it was done.  But it was not done until after it left the vehicle assembly plant.  It would have been X'd out if it was done before the first owner took delivery.
Bryon / 1968 Camaro SS 396 coupe - now 468 cubic inch BBC/M21
67 RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

69Z28-RS

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #186 on: August 17, 2018, 03:03:18 AM »
You see those 'peen outs' MUCH differently than I do... but I'm not going to change your mind, and you're not going to change mine with that data...  :)     They all look to have been 'peened' with a blunt tool, striking several times around the 'offending' letter... :)   Being done at different times, by different people potentially... they WILL look different.
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

bcmiller

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #187 on: August 17, 2018, 03:07:28 AM »
Peening does use a blunt tool. These are not the same. If they were done with a “tool” for a specific purpose surely you would agree there would be consistency.
« Last Edit: September 20, 2018, 06:39:20 AM by KurtS »
Bryon / 1968 Camaro SS 396 coupe - now 468 cubic inch BBC/M21
67 RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

cook_dw

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #188 on: August 17, 2018, 11:14:25 AM »
Are there any other "peened" diffs besides BU known?
Darrell Cook


If you have a 68 L78 or Z28 Camaro please contact me so I can add your vehicle to my database.

bcmiller

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #189 on: August 17, 2018, 12:10:14 PM »
Nope.

Moving on...
Bryon / 1968 Camaro SS 396 coupe - now 468 cubic inch BBC/M21
67 RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

ko-lek-tor

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #190 on: August 17, 2018, 01:43:28 PM »
Nope.

Moving on...
Disagree. I’ve seen a BE peened.
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1969 SS 350 coupe LeMans Blue 713 bought in 79(sold)
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69Z28-RS

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #191 on: August 17, 2018, 03:37:55 PM »
:)    Title the new thread 'PEENING'... so we can find it easily when we find 'new' example photographs!  :)
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

bcmiller

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Re: Earliest 3969341 and Latest 3894860 axles
« Reply #192 on: August 20, 2018, 10:12:52 PM »

The peening topic was started in a new thread. If anyone want to discuss that, then please post anything related to that in that thread. Thank you!
« Last Edit: September 18, 2018, 04:03:44 PM by bcmiller »
Bryon / 1968 Camaro SS 396 coupe - now 468 cubic inch BBC/M21
67 RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016