General Motors Corporation Drive Axle Gear Ratios
Official GM Web Site http://www.gm.com
General Motors Production Options.
The following Regular Production Option (RPO) codes identify the rear axle and transaxle overall final drive gear Ratios. These codes can be located on the RPO sticker in the glove box or in the trunk on most GM vehicles. Axle codes typically begin with the letter D, F, G, H, or Numerical.

These codes are arranged in alphanumeric order.
D-codes - F-codes - G-codes - H-codes - Numerical Codes (MD Trucks) - Imported GM Vehicles
| RPO | Ratio | Axle Type |
| D70 | 2.77 | Transaxle |
| D93 | 2.95 | Transaxle |
| D92 | 3.08 | Transaxle |
| RPO | Ratio | Axle Type |
|
G44 |
3.07 |
Rear |
| G72 | 2.14 | Rear |
| G75 | 3.62 | Rear |
| G82 | 4.33 | Transaxle |
| G83 | 4.47 | Transaxle |
|
G84 |
3.70 |
Rear |
| G89 | 4.13 | Transaxle |
|
G90 |
3.15 |
Rear |
|
G91 |
6.83 |
Rear |
|
GH0 |
3.54 |
Rear |
|
GH1 |
3.55 |
Rear |
| GH2 | 2.29 | Rear |
| GH3 | 2.77 | Rear |
| GH4 | 2.28 | Rear |
|
GH7 |
2.73 |
Rear |
|
GJ1 |
5.38 |
Rear |
|
GJ2 |
5.13 |
Rear |
|
GK7 |
4.78 |
Rear |
|
GK8 |
4.33 |
Rear |
|
GK9 |
4.63 |
Rear |
|
GL0 |
5.13 |
Rear |
|
GL3 |
6.17 |
Rear |
| GM0 | 3.58 |
Rear |
|
GM1 |
2.59 |
Rear |
|
GM2 |
3.44 |
Rear |
|
GM3 |
3.45 |
Rear |
|
GM4 |
3.67 |
Rear |
|
GM5 |
3.89 |
Rear |
|
GM6 |
4.22 |
Rear |
|
GM7 |
2.39 |
Rear |
|
GM8 |
2.56 |
Rear |
| GM9 | 3.63 | Rear |
|
GN9 |
4.11 |
Rear |
| GS0 | 6.43 |
Rear |
| GS4 | 2.70 | Rear |
|
GS8 |
3.94 |
Transaxle |
| GS9 | 3.46 |
Rear |
| GT1 | 5.63 |
Rear |
| GT2 | 4.77 |
Rear |
| GT3 | 4.55 |
Rear |
|
GT4 |
3.73 |
Rear |
|
GT5 |
4.10 |
Rear |
|
GT6 |
4.19 |
Transaxle |
|
GT7 |
3.33 |
Rear |
|
GT8 |
4.10 |
Rear |
| GT9 | 2.87 | Rear |
| GU1 | 2.41 | Rear |
|
GU2 |
2.73 |
Rear |
| GU3 | 2.93 | Rear |
|
GU4 |
3.08 |
Rear |
|
GU5 |
3.23 |
Rear |
|
GU6 |
3.42 |
Rear |
|
GU7 |
2.77 |
Rear |
|
GU8 |
3.90 |
Rear |
|
GU9 |
3.91 |
Rear |
|
GV0 |
3.55 |
Rear |
| GV1 | 3.85 |
Rear |
|
GV2 |
5.83 |
Rear |
|
GV3 |
3.57 |
Rear |
| GV4 | 3.36 | Rear |
|
GV5 |
3.82 |
Rear |
|
GV7 |
4.05 |
Rear |
| GV8 | 2.72 | Rear |
|
GV9 |
4.25 |
Rear |
| GW1 | 3.91 | Rear |
| GW4 | 3.31 | Rear |
| GW5 | 3.16 |
Transaxle |
|
GW6 |
3.27 |
Rear |
| GW8 | 2.92 | Rear |
|
GW9 |
2.93 |
Rear |
| GX1 | 5.43 | Rear |
|
GX3 |
3.33 |
Transaxle |
| GX4 | 3.75 | Rear |
| GX5 | 4.09 | Rear |
|
GX6 |
3.53 |
Rear |
|
GX8 |
3.74 |
Transaxle |
| GY1 | 3.85 |
Transaxle |
|
GY2 |
4.30 |
Rear |
|
GY3 |
4.29 |
Transaxle |
|
GY4 |
4.53 |
Rear |
| GY5 | 3.75 | Front |
|
GY7 |
4.18 |
Transaxle |
|
GY9 |
4.31 |
Rear |
| RPO | Ratio | Axle Type |
| H04 | 4.11 | Rear |
| H06 | 4.63 | Rear |
| H22 | 6.17 | Rear |
| H23 | 5.43 | Rear |
| HA3 | 5.29 | Rear |
| HA5 | 4.63 | Rear |
| HC1 | 4.62 | Rear |
| HC2 | 2.76 | Rear |
| HC3 | 5.12 | Rear |
| HC4 | 4.56 | Rear |
| HC7 | 5.13 | Rear |
| HC8 | 3.21 | Rear |
| HC9 | 5.13 | Rear |
| HD1 | 5.83 | Rear |
| HE3 | 3.07 | Rear |
| HE4 | 3.40 | Rear |
| HF7 | 4.56 | Rear |
| HF8 | 4.88 | Rear |
| HF9 | 4.89 | Rear |
| HJ1 | 4.55 | Rear |
| HJ2 | 5.86 | Rear |
| HJ3 | 4.75 | Rear |
| HJ4 | 6.50 | Rear |
| HJ5 | 5.57 | Rear |
| HJ6 | 4.78 | Rear |
| HJ7 | 4.88 | Rear |
| HK1 | 2.87 | Rear |
| HK3 | 6.14 | Rear |
| HK9 | 5.86 | Rear |
| HO4 | 4.11 | Rear |
| HO6 | 4.63 | Rear |
The following year import vehicles did not have or use RPO codes, later model year vehicles did. Refer to the tables above.
Source: GM Production Options, GM Service Manuals 1976 - 2009.
This page was last modified Thursday, March 05, 2009 09:00:23 PM
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