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Number Decoding
This is Intended to be a source for decoding numbers for engines, rear axles, VINs, and others. I hope to have more up soon. If you would like to contribute just send me an e-mail.
Rear Axle
Example of code: GW G 218 D E
GW= Gear Ratio
1971 BL 3.07 open BM 3.31 open BR 3.07 posi BS 3.31 posi PI 2.56 open PJ 2.56 posi PO 3.08 open PR 3.08 posi GJ 2.56 open GK 2.56 posi GR 3.08 open GS 3.08 posi GT 3.36 open GW 3.36 posi
1972 GT 3.36 open JB 2.73 open JC 3.08 open JE 3.42 open JI 3.08 open JK 3.42 open JN 2.73 posi JQ 3.08 posi JS 3.42 posi JW 3.08 posi JY 3.42 posi PW 2.73 open PX 2.73 posi
| 1973 | JA | 2.73 open |
| JB | 3.08 open | |
| JC | 3.42 open | |
| JM | 2.73 posi | |
| JN | 3.08 posi | |
| JP | 3.42 posi | |
| 1974 | JA | 2.73 open |
| JB | 3.08 open | |
| JC | 3.42 open | |
| JM | 2.73 posi | |
| JN | 3.08 posi | |
| JP | 3.42 posi |
G= Plant
B= Buick C= Buffalo D= Cadillac G= Detroit Gear and Axle K= GM of Canada M= Pontiac/Canada O= Oldsmobile P= Pontiac W= Warren, MI
218= Date of Manufacture
001 January 1st 002 January 2nd 023 Febuary 3rd etc...
D= Shift
D= Day shift N= Night shift
1= Day shift 2= Night shift
E= Posi Source
- = No posi D= Dana E= Eaton G= Detroit G&A O= Oldsmobile W= Warren/Warner Motive