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Old 07-31-2014, 12:57:38 PM   #1
mgd1790
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71Z - Rear End, Cover, Inspection Mark Colors

Looking for the proper colors...

- Rear End
- Rear End Cover
- Bolts

Also, what tags and inspection marks should I add on there to make it look purdy/perfect?

Lastly, for the inspection marks, are they painted, marked with a crayon or whatever? If so, what are the source(s) for the proper materials to make those inspection marks and tags?
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1971 Z28 (LA), LT1 (CGP), M21, 02A Build, 3.73's, Mulsanne Blue/Black Stripes, Blue Interior/Blue Belts, Build Sheet. All SoCal until a few years back.

Old Rides

1974 Type LT Z28, L82, TH400, A/C, PW
1967 Biscayne 283/3-Speed, A/C Survivor (4-Door)
1980 Firebird, SD455 (From 1974 Trans Am SD455)
2000 Cadillac Escalade
2001 Yukon XL Denali
1986 GLH (220+ HP)
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Old 07-31-2014, 03:49:01 PM   #2
THNDER
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On a 1971 Z28, the rearend tubes are semi gloss black. The cast iron center section was left natural. The cover is natural as well. As far as inspection marks, I would not apply any unless you have photos of them originally being there. Mike
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Old 08-01-2014, 10:47:43 AM   #3
2ndGenCrazy
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Quote:
Originally Posted by THNDER
On a 1971 Z28, the rearend tubes are semi gloss black. The cast iron center section was left natural. The cover is natural as well. As far as inspection marks, I would not apply any unless you have photos of them originally being there. Mike

I have pictures of factory markings for a 1970 12 bolt axle from a Z28. No idea if they were used at the axle plant in 71. There were orange, green and white paint splotches.
LMK if you need the images.
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Old 08-01-2014, 01:07:30 PM   #4
70COPO
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Once you understand why the marks were used you might not want them on your axle.
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Old 08-01-2014, 11:29:14 PM   #5
mgd1790
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Assuming bolts are natural too...?
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1971 Z28 (LA), LT1 (CGP), M21, 02A Build, 3.73's, Mulsanne Blue/Black Stripes, Blue Interior/Blue Belts, Build Sheet. All SoCal until a few years back.

Old Rides

1974 Type LT Z28, L82, TH400, A/C, PW
1967 Biscayne 283/3-Speed, A/C Survivor (4-Door)
1980 Firebird, SD455 (From 1974 Trans Am SD455)
2000 Cadillac Escalade
2001 Yukon XL Denali
1986 GLH (220+ HP)
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Old 09-18-2014, 09:49:40 AM   #6
mgd1790
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Here is a picture from the site. Not sure who posted the comment before but they said 71's looked like this.

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1971 Z28 (LA), LT1 (CGP), M21, 02A Build, 3.73's, Mulsanne Blue/Black Stripes, Blue Interior/Blue Belts, Build Sheet. All SoCal until a few years back.

Old Rides

1974 Type LT Z28, L82, TH400, A/C, PW
1967 Biscayne 283/3-Speed, A/C Survivor (4-Door)
1980 Firebird, SD455 (From 1974 Trans Am SD455)
2000 Cadillac Escalade
2001 Yukon XL Denali
1986 GLH (220+ HP)
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Old 09-20-2014, 09:22:27 PM   #7
81BirdMan
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Quote:
Originally Posted by 70COPO
Once you understand why the marks were used you might not want them on your axle.

Weren't they used to signify that bolts were torqued, fluid filled, etc? What is bad about that?
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Old 09-21-2014, 12:25:27 AM   #8
70COPO
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In a general context... some assembly aids were used from time to time.

The white stripe on top of the backing plates - left and right - indicated top.

L on the left drum indicated Left and R indicated right. These aids assisted workers to be sure the rear end was not positioned upside down in the long line pedestal.

Spindles had colors the brakes had colors. Sometimes there was an X on top of the axle center.

Or not...it was dependent on the shift and the workers doing the build.

The color splotches OP is asking about were typically an indication of the identification of an "out of control condition" or OOC during the assembly process.

These color coded marks were used to identify the worker responsible for the OOC issue and the mark was applied to identify the assembly elements that the worker had performed work on. The mark was a validation that the element was performed correctly. The element requirement for a OOC check was typically 100 units.

IMO...If you find marks reproduce them. If you find no marks chances are it never had any to begin with.

If you want it to be 100% correct for a Norwood car be sure to include several round circular scratches on the axle tubes left and right. These scratches were the byproduct of the assembly process from the pedestal and storage racks the axle sat in prior to final assembly.
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Old 09-21-2014, 10:41:24 AM   #9
mgd1790
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They were but their usage varies widely from little to nothing to some shifts attacking a car with marks all over the place. I'm going to remove a lot of the grime slowly and lightly and see what I pickup, document and recreate or enhance the paint. From my LA car I didn't see much on the firewall but I do see some underneath very faintly as well as one some other places. We shall see.
__________________
1971 Z28 (LA), LT1 (CGP), M21, 02A Build, 3.73's, Mulsanne Blue/Black Stripes, Blue Interior/Blue Belts, Build Sheet. All SoCal until a few years back.

Old Rides

1974 Type LT Z28, L82, TH400, A/C, PW
1967 Biscayne 283/3-Speed, A/C Survivor (4-Door)
1980 Firebird, SD455 (From 1974 Trans Am SD455)
2000 Cadillac Escalade
2001 Yukon XL Denali
1986 GLH (220+ HP)
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Old 09-21-2014, 08:07:47 PM   #10
Bob R
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Quote:
Originally Posted by 70COPO
In a general context... some assembly aids were used from time to time.

The white stripe on top of the backing plates - left and right - indicated top.

L on the left drum indicated Left and R indicated right. These aids assisted workers to be sure the rear end was not positioned upside down in the long line pedestal.

Spindles had colors the brakes had colors. Sometimes there was an X on top of the axle center.

Or not...it was dependent on the shift and the workers doing the build.

The color splotches OP is asking about were typically an indication of the identification of an "out of control condition" or OOC during the assembly process.

These color coded marks were used to identify the worker responsible for the OOC issue and the mark was applied to identify the assembly elements that the worker had performed work on. The mark was a validation that the element was performed correctly. The element requirement for a OOC check was typically 100 units.

IMO...If you find marks reproduce them. If you find no marks chances are it never had any to begin with.

If you want it to be 100% correct for a Norwood car be sure to include several round circular scratches on the axle tubes left and right. These scratches were the byproduct of the assembly process from the pedestal and storage racks the axle sat in prior to final assembly.

Take Phil's advice SERIOUSLY.....
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