As You Go Thru Life... DO A WHEELIE !!!

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Year, Axle Code, Ratio, etc








Carrier ID

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Code Location
  1. 1971-1975 : Front of Right hand (passenger) tube,about 3" from carrier
  2. 1970 : W/C-lock axles-Front of Right hand (passenger) tube,about 3" from carrier
  3. 1970 : non c-lock axles-: Rear of left hand (driver) tube,about 3" from carrier
  4. 1967-1969 : Rear of left hand (driver) tube,about 3" from carrier and stamped on left rear brake drum.
  5. 1966 : Rear of right hand (passenger) tube


Rear Axle Assembly Codes

1970 and earlier axle code example: ZB 01 01 G E

Ratio Month Day Plant Posi Source
See Above:
 01 = January
02 = February
03 = March
04 = April
05 = May
06 = June
07 = July
08 = August
09 = September
10 = October
11 = November
12 = December
 01 = 1st
02 = 2nd
03 = 3rd
04 = 4th
05 = 5th
06 = 6th
07 = 7th
08 = 8th
09 = 9th
10 = 10th
etc...
 B = Buick
C = Buffalo
D = Cadillac
G = Detroit Gear & Axle
K = GM of Canada
M = Pontiac/Canada
O = Oldsmobile
P = Pontiac
W = Warren, MI
 - = No positraction
D = Dana Positraction Differential
E = Eaton Positraction Differential
G = Detroit G&A Positraction Carrier
O = Oldsmobile Positraction Carrier
W = Warren/Warner Motive

1971 and later rear axle code example: GX G 218 D E

Ratio Plant Day of Year Shift Posi Source
See Above:
 B = Buick
C = Buffalo
D = Cadillac
G = Detroit Gear & Axle
K = GM of Canada
M = Pontiac/Canada
O = Oldsmobile
P = Pontiac
W = Warren, MI
 001 = January 1st
002 = January 2nd
031 = January 31st
etc...
 D = Day shift
N = Night shift
1 = Day shift
2 = Night shift
 - = No positraction
D = Dana Positraction Differential
E = Eaton Positraction Differential
G = Detroit G&A Positraction Carrier
O = Oldsmobile Positraction Carrier
W = Warren/Warner Motive