Before ordering a replacement transmission you need its exact model code. Here are the reliable ways to find it.
GM trucks, SUVs and cars: the RPO code sticker
GM vehicles carry a Service Parts Identification label, usually in the glovebox, on the spare tire cover or inside the console lid, listing three-character RPO codes. The transmission is one of them: M30 is a 4L60E, M32 a 4L65E, MT1 a 4L80E, MYC a 6L80 and MYD a 6L90.
Ford: the door-jamb label
Ford’s Safety Compliance Certification label on the driver’s door jamb includes a transmission code, marked TR. A Ford dealer can decode it from your VIN.
Dodge and Ram
Use your VIN with a dealer or parts lookup, or read the identification tag or stamping on the transmission case.
Look at the transmission itself
Many transmissions have an ID tag or stamped number on the case, and the oil pan shape and bolt count help tell similar units apart. For example, the GM 4L60E pan has 16 bolts and the 4L80E pan 17.
Common transmission codes and where they are used
| Code | Type | Typical vehicles |
|---|---|---|
| 4L60E | four-speed automatic with overdrive | light-duty GM trucks, SUVs and cars |
| 4L65E | four-speed automatic with overdrive (strengthened 4L60E with five-pinion planetaries) | higher-output GM V8 trucks and SUVs |
| 4L80E | heavy-duty four-speed automatic with overdrive | GM heavy-duty trucks and vans |
| 6L80E | six-speed automatic | GM light-duty trucks, SUVs and performance cars |
| 8L90 | eight-speed automatic | late-model GM trucks, SUVs and performance cars |
| Allison 1000 | heavy-duty automatic | GM heavy-duty trucks, including Duramax diesel applications |
| 47RE | heavy-duty four-speed automatic with overdrive | Dodge Ram 2500 and 3500 trucks |
| 48RE | heavy-duty four-speed automatic with overdrive | Dodge Ram 2500 and 3500 trucks |
| 545RFE | five-speed automatic | Dodge Ram, Dakota, Durango and Jeep applications |
| 68RFE | heavy-duty six-speed automatic | Ram 2500, 3500 and 4500 trucks |
| 4R70W | four-speed automatic with overdrive | Ford F-150, Mustang and full-size Ford cars |
| 4R100 | heavy-duty four-speed automatic with overdrive | Ford Super Duty trucks and vans |
| E4OD | heavy-duty four-speed automatic with overdrive | Ford F-250/F-350 trucks and vans |
| 5R110W | heavy-duty five-speed automatic | Ford Super Duty trucks |
| 6R80 | six-speed automatic | Ford F-150, Expedition and Mustang |
Each code has its own page with the units we carry: start at transmissions by code or shop by make: Chevy and GMC · Ford · Dodge and Ram.
Why the exact code matters
Transmissions that share a code can still differ in bellhousing pattern, case length, output shaft, electrical connectors and 2WD or 4WD layout between model years, so match the year, engine and drivetrain as well as the code. That is also why the same truck can take a different unit after a mid-year change.
Still not sure?
Send us your VIN with the year, make, model and engine, and a parts specialist will confirm the correct transmission before you order.
Shop: transmissions by code · 4L60E · 4L80E · 6L80E · 68RFE · 4L60E vs 4L65E vs 4L80E.
Shipping is a flat $80.00 per order to US addresses, with 15-day free returns. Not sure which one fits? Ask a parts specialist.