Odd rear end stamping 'CHC' ? - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

 
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post #1 of 7 (permalink) Old Sep 16th, 02, 7:07 PM Thread Starter
 
Join Date: Sep 2002
Location: elk river, MN
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I just pulled the stamping 'CHC 053 2 E' from the rear axle tube of my '70 SS. I was aware that the rear gears were much lower than stock (approx 30% speedo error) but cannot find any reference to CHC...any help appreciated. Also - the 'E' looks to have been stamped later, is larger and deeper than the rest of the stamping. WTF?
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post #2 of 7 (permalink) Old Sep 16th, 02, 10:08 PM
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This is the 71-72 format not 70.
CH= 2.73 posi
C= Chevy Buffalo plant
053= assembled 53rd day of year
2= 2nd work shift
E= Eaton posi
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post #3 of 7 (permalink) Old Sep 16th, 02, 10:16 PM
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Are you positive it's CHC I can't find it in the book. I got CKC or CCH

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post #4 of 7 (permalink) Old Sep 16th, 02, 10:18 PM
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Hey Shooter good call where did you find that info?

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71 SS Chevelle
454/495
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12 Bolt 4:11 Posi
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post #5 of 7 (permalink) Old Sep 16th, 02, 10:34 PM
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This date format of day numbering started in 71. A 70 with the same date would be Month and Day ( 0222) for Feb 22nd. As well as the Plant is the 3rd letter for 71.The first C in 70 is Chevy and the plant is at the end of the code with B for Buffalo.This would be CCH 0222B code for a 70. The casting date with the year will be small raised lettering on the center section (cover side)Where a Letter for month and numbers for day and last digit of year is used. B151 is Feb 15th 71 for example.

[This message has been edited by shooter (edited 09-16-2002).]

[This message has been edited by shooter (edited 09-16-2002).]
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post #6 of 7 (permalink) Old Sep 17th, 02, 12:15 AM
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Hey Mark, remember what I said about learning something new every day!

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ACES #5032
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post #7 of 7 (permalink) Old Sep 17th, 02, 11:10 AM Thread Starter
 
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Thanks for the information. I jacked up the car and checked the ratio by comparing driveshaft to tire revolutions. Appears to be a 3.73. Definately posi. Anyone want to swap complete rear housings and/or gears? I want to return the car to original 3.31 positraction.
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