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1970 El Camino Rear Axle Identification

 

 

The rear axle identification code consists of a three letter prefix indicating the gear ratio, four digits indicating the assembly date as month/day, and a single letter suffix indicating the manufacturing location. The identification code should be stamped on the bottom or font of right axle tube either adjacent to the carrier housing or about 8" - 10" inboard from the backing plates. The particular engine RPO code is listed in parentheses as found on build sheets.

Example: CGI0629B decodes to CGI ~ 3.36 Positraction, 0629 ~ Month [June] and Day [29], B ~ Buffalo (G=Chevrolet Gear & Axle, W=Warren, K=McKinnon Industries). If a "1" or "2" exists, it indicates the plant shift number.

Casting Numbers:
12-Bolt Casting #3969278
10-Bolt Casting #3969277

The casting numbers/letters on rear end housings may have either a prefix or suffix of "N" or "NF" and no reason has been found yet why they may have one or the other. Codes below are for Chevelle & Monte Carlo.

Prefix Axle Ratio
CCA 3.08 ~ 10-bolt (L14/307 & L22/250)*
CCB 3.36 ~ 10-bolt
CCD 3.07 ~ 12-bolt Positraction
CCE 3.08 ~ 10-bolt Positraction
CCF 3.31 ~ 12-bolt Positraction (L34/402, LS6/454)*
CCG 3.36 ~ 10-bolt Positraction
CCH 2.73 ~ 12-bolt Positraction (L48/350-4)*
CCL 2.56
CCM 2.56 ~ Positraction
CCN 2.56
CCO 2.56 ~ Positraction
CCP 2.73 ~ 10-bolt (L14/307)*
CCW 3.31 ~ 12-bolt (L34/402 & LS3/402 M.C.)*
CCX 3.07 ~ 10-bolt
CGA 2.56 ~ 10-bolt (L65/350-2)*
CGB 2.56 ~ 10-bolt Heavy Duty Positraction (L65/350-2)*
CGC 2.73 ~ Heavy Duty
CGD 2.73 ~ Heavy Duty Positraction
CGE 3.08 ~ 10-bolt Heavy Duty
CGF 3.08 ~ 10-bolt Heavy Duty Positraction
CGG 3.36 ~ 10-bolt Heavy Duty
CGI 3.36 ~ 10-bolt Heavy Duty Positraction
CKC 2.73 ~ Positraction
CKD 2.73 ~ 12-bolt (L48/350-4 & LS3/402)*
CKF 3.55 ~ 12-bolt Positraction (L78)*
CKJ 3.55 ~ 12-bolt (L78/402)*
CKK 4.10 ~ 12-bolt Positraction
CRJ 2.56
CRK 2.56 ~ 12-bolt Positraction (LS5/454)*
CRL 3.07 ~ 12-bolt
CRM 3.07 ~ 12-bolt
CRU 3.31 ~ 12-bolt (LS5/454)*
CRV 3.31 ~ 12-bolt Positraction (LS5/454 & LS6/454)*
CRW 4.10 ~ 12-bolt Heavy Duty (LS6/454)*
Assembly Month - 1st and 2nd numbers
Number Month Number Month
01 January 02 February
03 March 04 April
05 May 06 June
07 July 08 August
09 September 10 October
11 November 12 December

Assembly Day - 3rd and 4th numbers
01...31

Rear Axle Assembly Plant - 5th letter

Code Assembly Plant
B Buffalo ~  New York
G Chevrolet Gear & Axle
W Warren ~  Michigan
K McKinnon Industries

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CCF ~ Positraction 3.31 - November 6, Buffalo, 1st shift

12/19/2009
CRV ~ Positraction 3.31 - December 08, Buffalo, 2nd shift

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CRV ~ Positraction 3.31 - December 22, Buffalo, 1st shift

File Photo - 03/01/2009
CCH ~ Positraction 2.73 - February 18, Buffalo, 1st shift

File Photo - 04/12/2009
CCF ~ Positraction 3.31 - March 25, Buffalo, 1st shift

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CCF ~ Positraction 3.31 - April 8, Buffalo, 2nd shift

File Photo - 06/09/2009
CCF ~ Positraction 3.31 - May 21, Buffalo, 1st shift

* Engine RPO code and size following the rear axle ratio are taken from build sheets and/or Protect-O-Plates and may not reflect the only engines the rear axle codes came with. Where there are no RPO/engine information following the rear axle code only means I do not have build sheets and/or Protect-O-Plates to verify them.