General Motors Corporation Transmission Gear Ratios

Official GM Web Site http://www.gm.com, for GM transmissions www.gmpowertrain.com

General Motors Production Options.

The following Regular Production Option (RPO) codes identify transmissions and their gear Ratios. These codes can be located on the RPO sticker in the glove box or in the trunk on most GM vehicles.  Transmission codes typically begin with the letter M.

Click here for Medium Duty Truck Transmission Gear Ratios

 

1980 - 2008 GM Rear Wheel Drive Transmissions

 

1980 - 2008 GM Front Wheel Drive Transaxles

GM Rear Wheel Drive Transmissions

Six Speed Automatic Transmissions

RPO

Trans Name

First

Second

Third

Fourth

Fifth

Sixth

MNK

Allison 1000

3.10

1.81

1.41

1.00

0.71

0.62

MNZ

Allison 1000

3.10

1.81

1.41

1.00

0.71

0.62

MW7

Allison 1000

3.10

1.81

1.41

1.00

0.71

0.62

MYB

6L50

4.027

2.364

1.532

1.152

0.852

0.667

MYC

6L80

4.027

2.364

1.532

1.152

0.852

0.667

Five Speed Automatic Transmissions

RPO Trans Name First Second Third Fourth Fifth
M74 Allison 1000 3.10 1.81 1.41 1.00 0.71
M22 5L50-E 3.45 2.21 1.59 1.00 0.76
M82 5L40-E 3.46 2.21 1.59 1.00 0.76
MTW Allison 2400 3.51 1.90 1.44 1.00 0.74
MX4 Allison 2000 3.51 1.90 1.44 1.00 0.74
MX5 5L40-E with PTU* 3.46 2.21 1.59 1.00 0.76
MV3 5L50-E with PTU* 3.45 2.21 1.59 1.00 0.76
 *PTU = Power Transfer Unit (4WD/AWD)

Four Speed Automatic Transmissions

RPO Trans Name First Second Third Fourth
M30 4L60-E 3.059 1.625 1.000 0.696
M32 4L60-E HD 3.059 1.625 1.000 0.696
M32 4L65-E 3.059 1.625 1.000 0.696
M33 4L60-E Hybrid 3.059 1.625 1.000 0.696
M41 4L30-E 2.860 1.620 1.000 0.723
M70 4L70-E Super Duty 3.059 1.625 1.000 0.696
M99 2ML70 2-mode Hybrid* 3.692  1.705 1.000 0.738
MD8 4L60 3.059 1.625 1.000 0.696
ML4 4L30-E 2.400 1.479 1.000 0.723
MN8 4L80-E HD 2.482 1.482 1.000 0.750
MN8 4L85-E 2.482 1.482 1.000 0.750
MT1 4L80-E 2.482 1.482 1.000 0.750
MW9 HM 200-4R 2.740 1.570 1.000 0.670
*EVT Mode 1 The 2ML70 can operate in electric mode or non-electric mode in first gear with a gear ratio of infinity to 1.70:1.
EVT Mode 2 The 2ML70 operates in non-electric mode with a gear ratio of 1.70 - 0.738:1


Three Speed Automatic Transmissions

RPO Trans Name First Second Third
M40 3L80 2.480 1.480 1.000
M41 3L80HD 2.482 1.482 1.000
M65 3L30 2.400 1.480 1.000
MD2 3L30 2.400 1.480 1.000
MD3 HM-180 2.400 1.480 1.000
  HM-200C 2.740 1.570 1.000
  HM-350 2.520 1.520 1.000
  HM-400 2.480 1.480 1.000
 

GM Front Wheel Drive Transaxles

 

Six Speed Automatic Transaxles

RPO

Trans Name

First

Second

Third

Fourth

Fifth

Sixth

MH2

6T70 (FWD)

4.484

2.872

1.842

1.414

1.000

0.742

MH4

6T70 (FWD)

4.484

2.872

1.842

1.414

1.000

0.742

MH6

6T75 (AWD)

4.484

2.872

1.842

1.414

1.000

0.742
MH7 6T40 X23FHD 4.584 2.964 1.912 1.446 1.000 0.746
MH8 6T45 X23F 4.584 2.964 1.912 1.446 1.000 0.746

MY9

6T75 (AWD)

4.484

2.872

1.842

1.414

1.000

0.742


Five Speed Automatic Transaxles

RPO

Trans Name

First

Second

Third

Fourth

Fifth

 

Aisin-AW 55-51LE

4.685

2.942

1.923

1.301

1.000

M09

Aisin-AW AF33-5

4.685

2.942

1.923

1.301

1.000

M43

Aisin-AW AF23-5

4.685

2.942

1.923

1.301

1.000

M45

Aisin-AW AF33-5

4.685

2.942

1.923

1.301

1.000
M98 AF33-5 4.575 2.979 1.947 1.318 1.000

MJ7

Honda 5AT

2.185

1.270

1.023

0.729

0.530

MJ8

Honda 5AT w/PTU*

2.185

1.270

1.023

0.729

0.530
MLS Aisin 50-40E 4.575 2.979 1.947 1.318 1.000

MU3

Saab 76.5mm

3.385

1.760

1.179

0.894

0.700

*PTU = Power Transfer Unit (Crossover SUV AWD/4WD)

Four Speed Automatic Transaxles

RPO Trans Name First Second Third Fourth
MLQ Aisin 81-40LE 2.875 1.568 1.000 0.697
  Aisin ZF 4HP 16 2.719 1.487 1.000 0.717

 

HM 325-4L 2.740 1.570 1.000 0.670
  Jatco JF405-E 2.914 1.525 1.000 0.725

M10

Jatco JF403-E 3.027 1.619 1.000 0.694

M13

4T60-E HD 2.921 1.568 1.000 0.705

M13

4T60-E 2.921 1.568 1.000 0.705

M15

4T65E 2.921 1.568 1.000 0.705
M45 Aisin-AW AF33 4.685 2.942 1.923 1.301

M57

A245-E 3.639 2.006 1.295 0.892

M76

4T65E with PTU* 2.921 1.568 1.000 0.705

MD7

4T65E 2.921 1.568 1.000 0.705
ME7 4T45-E BAS Hybrid 2.960 1.626 1.000 0.681

ME8

4T60 2.921 1.568 1.000 0.705

ME9

440-T4/F7 2.921 1.568 1.000 0.705

MH1

4T80-E 2.960 1.626 1.000 0.681

MN3

4T65E 2.921 1.568 1.000 0.705

MN4

4T40/45-E 2.960 1.626 1.000 0.681

MN5

4T45-E 2.960 1.626 1.000 0.681

MN7

4T65E HD 2.921 1.568 1.000 0.705

MS7

A240-E 3.639 2.006 1.295 0.892
MU4 A246-E 4.005 2.208 1.425 0.981
MU5 U341-F 2.847 1.552 1.000 0.700

*PTU = Power Transfer Unit (Crossover SUV AWD/4WD)

 

Three Speed Automatic Transaxles

RPO

Trans Name

First

Second

Third

M60

GEO Metro

2.810

1.550

1.000

MB3

A131L

2.811

1.549

1.000

MD9

3T40

2.840

1.600

1.000

MX1

A131L

2.810

1.550

1.000

 

GEO Storm

2.841

1.541

1.000

 

HM-425

2.482

1.482

1.000

 


Six Speed Manual Transmissions

RPO Trans Name First Second Third Fourth Fifth Sixth
M10 Tremec 85mm 3.010 2.07 1.43 1.00 0.840 0.570
M12 Tremec T56 2.970 2.070 1.430 1.000 0.840 0.570
ML6 ZF S6-650 5.790 3.310 2.100 1.310 1.000 0.720
ML9 ZF S6-40 2.640 1.800 1.290 1.000 0.750 0.490
MM6 Tremec T56 2.660 1.780 1.300 1.000 0.740 0.500
MV1 Aisin 85mm 4.170         0.790
MV5 Aisin D173 AY6            
MV6 Aisin 85mm 4.170         0.790
MZ6 Tremec 85mm 2.970 2.070 1.430 1.000 0.710 0.570


Five Speed Manual Transmissions

RPO Trans Name First Second Third Fourth Fifth
M35 Getrag 260 3.830 2.190 1.400 1.000 0.810
M35 Getrag 260 (2003-2004 Cadillac CTS) 3.570 2.040 1.340 1.000 0.820
M49 BW 5spd 3.750 2.190 1.410 1.000 0.720
M50 NV3500 3.490 2.160 1.400 1.000 0.780
M59 GEO Tracker 3.652 1.947 1.374 1.000 0.864
M86 Getrag F23 75mm 3.58 2.02 1.35 0.98 0.69
M94 Getrag F23 3.58 2.02 1.35 0.98 0.69
M96 Tremec 109mm 5.81 2.94 1.61 1.00 0.77
MA5 Aisin AR5 82mm 3.753 2.26 1.37 1.00 0.729
MG3 Getrag F23 3.58 2.02 1.35 0.98 0.81
MG5 NV3500 4.016 2.318 1.401 1.000 0.729
M50 NV3500 3.490 2.160 1.400 1.000 0.780
M51 NV3550 3.490 2.160 1.400 1.000 0.780
MH3 Tremec T-5 3.500 2,140 1.390 1.000 0.730
MK5 C59 3.166 1.904 1.310 0.969 0.815
ML2 Tremec T-5 4.030 2.370 1.490 1.000 0.720
ML3  Tremec T-5 3.760 2.180 1.420 1.000 0.720
MT8 NV4500 6.340 3.440 1.710 1.000 0.730
MU3 Saab F25 3.38 1.76 1.18 0.89 0.70
MW2 NV1500 3.940 2.370 1.490 1.000 0.830
MW3 NV4500 109mm 5.610 3.040 1.670 1.000 0.750
TR-3450 3.82 2.31 1.42 1.00 0.83
TR-4050 5.81 2.94 1.61 1.00 0.77
TR-4050 6.16 3.11 1.71 1.00 0.76
2007 Chevrolet Optra and Spark (Trans code Y4A) 3.416 1.950 1.280 0.971 0.757
2007 Chevrolet Optra and Spark (Trans code Y4M) 3.416 1.950 1.280 0.971 0.757


Four Speed Manual Transmissions

RPO Trans Name First Second Third Fourth
M20 HM-117 6.555 3.580 1.700 1.000
M73 Isuzu 4.010 2.250 1.420 1.000
MC0 Getrag 4.020 2.300 1.400 1.000
MC9 BW 4.030 2.370 1.490 1.000
MY6 NP260 3.090 1.670 1.000 0.730

Six Speed Manual Transaxles

RPO Trans Name First Second Third Fourth Fifth Sixth
MT2 Opel F40 83mm 3.77 2.04 1.37 1.05 0.85 0.62
MU9 Opel F40 83mm 3.77 2.04 1.37 1.05 0.85 0.62

MTN

   Toyota C60 3.166 2.050 1.481 1.166 0.916 0.725


Five Speed Manual Transaxles

RPO Trans Name First Second Third Fourth Fifth
- D-16 (2005-2008 Chevrolet Aveo 1.4 DOHC / 1.5L) 3.545 1.952 1.276 0.971 0.763
- D-16 (2005-2008 Chevrolet Aveo 1.4 SOHC) 3.545 1.952 1.276 0.892 0.707
- Y4A (2007 Pontiac Matiz) 3.416 1.950 1.280 0.971 0.757
- YM4 (2005-2007 Chevrolet Aveo) 3.417 1.950 1.280 0.971 0.758
- D-20 (2005-2007 Chevrolet Epica) 3.545 2.158 1.478 1.129 0.886
L73 Pontiac LeMans F16 3.410 1.950 1.270 0.890 0.710

M42

Geo Metro          
M43 AF23 4.685 2.942 1.923 1.301 1.000
M49 BW 5spd 3.750       0.760
M58 Geo Metro 3.420 1.890 1.280 0.910 0.760
M79 LeMans F13 3.550 2.390 1.300 0.890 0.730
M86 Getrag F23 (5T45MI) 3.58 2.02 1.35 0.98 0.69
M94 Getrag F23 3.58 2.02 1.35 0.98 0.69
M98 Aisin 55-51E          
MB4 Geo Prizm 1.8L 3.545 1.904 1.233 0.885 0.725
MB5 Geo Prizm  3.545 1.904 1.233 0.885 0.725
MFB  2008 Chevrolet Epica 5-Speed S/R (D24)          
MFN  2008 Chevrolet Epica 5-Speed S/R (D33)          
MG1 HM-282 3.500 2.190 1.380 0.940 0.720
MG2 HM-282 3.500 2.050 1.380 0.940 0.720
MG3 Getrag F23 3.58 2.02 1.35 0.98 0.81
MJ1 Isuzu 3.730 2.180 1.330 0.920 0.740
MK7 Isuzu 3.910 2.180 1.450 1.030 0.740
MLM Y4M (2008 Chevrolet Aveo 1.6 DOHC) 3.417 1.950 1.280 0.971 0.758
MR3 Isuzu 3.730 2.180 1.330 0.920 0.740
MU3 Saab F25 3.48 1.76 1.18 0.89 0.70
MV2 Chevrolet Sprint 3.420 1.890 1.280 0.910 0.760
MY7 Early J-car 3.910 2.150 1.330 0.920 0.740

 

Continuously Variable Transaxles

 

For more information on CVT's, click here.

RPO

Trans Name

Lowest

Highest

M83

V20-E

2.618

0.443

M75

V25-E

2.618

0.443

M16

V25-E AWD

2.618

0.443

 

Source: GM Production Options, Effective June 2000, GM Service Manuals 1985 - 2009.

This page was last modified Tuesday, October 13, 2009 08:08:31 PM

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