RPO Codes are a system that GM uses to identify which parts and options are on any particular vehicle that they manufacture. RPO codes are typically placed in the glove compartment, which allows you to view the options on your vehicle without ever cracking the hood, or crawling under the car. GM Transmission RPO Codes start with the letter M.
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General Motors Transmission RPO Codes | |||
RPO Code | Transmission Name | Auto or Manual? | # of Forward Gears |
M08 | Borg Warner- 4 Speed | Manual | 4 |
M13 | 4T60-E | Auto | 4 |
M15 | 4T65-E | Auto | 4 |
M17 | Muncie- 4 Speed | Manual | 4 |
M20 | Muncie- 4 Speed | Manual | 4 |
M21 | Muncie- 4 Speed | Manual | 4 |
M22 | Muncie- 4 Speed | Manual | 4 |
M26 | Muncie- 4 Speed | Manual | 4 |
M27 | Getrag- 5 Speed | Manual | 5 |
M28 | Borg Warner- 6 Speed | Manual | 6 |
M29 | Borg Warner- 6 Speed | Manual | 6 |
M30 | 4L60E | Auto | 4 |
M31 | TH250 | Auto | 3 |
M32 | 4L65E | Auto | 4 |
M33 | TH350 | Auto | 3 |
M34 | TH125 | Auto | 3 |
M35 | Powerglide | Auto | 2 |
M38 | TH350 | Auto | 3 |
M39 | Borg Warner- 5 Speed | Manual | 5 |
M40 | TH400 | Auto | 3 |
M49 | Borg Warner- 5 Speed | Manual | 5 |
M49 | TH350 | Auto | 3 |
M50 | NVG- 5 Speed | Manual | 5 |
M51 | Isuzu- 6 Speed | Manual | 6 |
M62 | 3 Speed | Manual | 3 |
M63 | ZF | Manual | 4 |
M64 | 3 Speed | Manual | 3 |
M73 | Isuzu- 4 Speed | Manual | 4 |
M75 | 5 Speed | Manual | 5 |
M77 | Borg Warner-4 Speed | Manual | 4 |
M79 | Isuzu 5 Speed | Manual | 5 |
MB1 | Borg Warner- 5 Speed | Manual | 5 |
MB4 | Borg Warner- 5 Speed | Manual | 5 |
MB6 | Borg Warner- 5 Speed | Manual | 5 |
MC0 | Getrag- 4 Speed | Manual | 4 |
MC4 | Borg Warner- 5 Speed | Manual | 5 |
MC5 | Borg Warner- 5 Speed | Manual | 5 |
MC9 | Borg Warner-4 Speed | Manual | 4 |
MD2 | TH180C | Auto | 3 |
MD3 | TH180 | Auto | 3 |
MD5 | Getrag- 5 Speed | Manual | 5 |
MD8 | 700R4 | Auto | 4 |
ME2 | 5 Speed Manual | Manual | 5 |
ME2 | 6 Speed Manual | Manual | 6 |
ME9 | TH440 T4 | Auto | 4 |
MF2 | Borg Warner-4 Speed | Manual | 4 |
MG1 | Muncie- 5 Speed | Manual | 5 |
MG2 | Getrag- 5 Speed | Manual | 5 |
MG3 | Muncie- 5 Speed | Manual | 5 |
MG4 | Isuzu 5 Speed | Manual | 5 |
MG5 | Getrag- 5 Speed | Manual | 5 |
MH2 | Borg Warner- 5 Speed | Manual | 5 |
MH3 | Borg Warner- 5 Speed | Manual | 5 |
MH5 | Doug Nash- 4 Speed | Manual | 4 |
MH6 | 6T75 | Auto | 6 |
MK2 | Doug Nash- 4 Speed | Manual | 4 |
MK4 | Borg Warner- 5 Speed | Manual | 5 |
MK5 | Borg Warner- 5 Speed | Manual | 5 |
MK6 | Borg Warner- 5 Speed | Manual | 5 |
ML2 | Borg Warner- 5 Speed | Manual | 5 |
ML3 | Borg Warner- 5 Speed | Manual | 5 |
ML6 | ZF | Manual | 6 |
ML8 | Borg Warner- 5 Speed | Manual | 5 |
ML9 | Muncie- 4 Speed | Manual | 4 |
MN8 | 4L85E | Auto | 4 |
MR2 | Muncie- 4 Speed | Manual | 4 |
MR5 | Isuzu- 5 Speed | Manual | 5 |
MR6 | Isuzu- 5 Speed | Manual | 5 |
MR8 | Isuzu- 5 Speed | Manual | 5 |
MS7 | Toyota Auto | Auto | 4 |
MT1 | 4L80E | Auto | 4 |
MT2 | Isuzu- 5 Speed | Manual | 5 |
MT8 | NV4500 | Manual | 5 |
MV4 | TH350C | Auto | 3 |
MV9 | TH200C | Auto | 3 |
MW1 | Borg Warner- 5 Speed | Manual | 5 |
MW3 | NV4500 | Manual | 5 |
MW4 | Getrag- 5 Speed | Manual | 5 |
MW9 | 200-4R | Auto | 4 |
MX2 | TH350C | Auto | 3 |
MX6 | Muncie- 4 Speed | Manual | 4 |
All information within above border to be printed exactly as shown on 8 1/2 x 11 white 16 pound bond paper. Fl studio for mac image line. Print on both sides, excluding templates. Shop 4L85E parts and get Free Shipping on orders over $99 at Speedway Motors, the Racing and Rodding Specialists. 4L85E parts in-stock with same-day shipping.
4l85e With Straight Cut Gears
The 4L85-E (RPO MN8) is rated to handle vehicles with up to 690 ftlbf (935 Nm) of torque. The 4L85E is rated to handle vehicles with a GVWR of up to 18,000 lbs (dependent on axle ratio and vehicle). 4L80E/4L85E Torque Converter 4L80E/4L85E Torque Converter Family: Torque Converter Remanufacturing Standards GM 4L80E / 4L85E. Replacement of all worn or damaged hubs; 100% new Friction Linings; 100% new Bearings; All Pistons machined to exceed factory trueness specs; Outer Diameter trimmed to assist with better balance and function; HD and HP.
4l85e Wiring
If you see any errors, or would like to add an RPO code, just leave it in the comments and I’ll throw it on. There’s no definitive place to find these. Hopefully with enough input, that can change.
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