Identifying a Dodge transmission by serial number is one of the most reliable ways to determine exactly what transmission is installed in a vehicle, especially when visual inspection is not enough.
The serial number, build tag, or transmission identification code helps you confirm the exact model, production year, and compatibility for repair or replacement.
Dodge Transmission Identification By Serial Number
| Transmission Model | Years Used | Vehicle Applications | Serial Number / ID Location | Identification Method | Key Identification Details |
|---|---|---|---|---|---|
| A727 (Torqueflite 3-Speed) | 1962–1990 | Muscle cars, Dodge trucks | Case stamping / pan rail tag | Casting + tag code | Heavy-duty 3-speed automatic |
| A904 (Torqueflite 3-Speed) | 1960s–1990s | Small-block Dodge cars | Driver-side case stamping | Casting number ID | Lightweight 3-speed auto |
| A998 / A999 | 1970s–1990s | Dodge trucks, vans | Case stamping | Tag + casting number | Reinforced A904 variants |
| A670 | 1980s–1990s | Compact Dodge cars | Transmission case stamp | Casting code | Economy 3-speed automatic |
| A500 / 42RH / 44RH | 1980s–1990s | Dakota, Ram trucks | Side tag on case | Tag + hydraulic ID | Overdrive version of A904 |
| 41TE / A604 | 1989–2005 | Dodge Caravan, minivans | Pan tag / scan tool | Electronic ID | FWD 4-speed automatic |
| 42RE | 1993–2004 | Jeep/Dodge trucks | Case side tag | VIN + tag decode | Light-duty electronic auto |
| 42RLE | 2003–2012 | Jeep Liberty, Wrangler, Dodge | Pan tag + TCM | Scan tool + VIN | 4-speed longitudinal FWD/RWD hybrid |
| 44RE | 1993–2003 | 4×4 Ram trucks | Transmission tag | Tag + VIN decode | Stronger 42RE variant |
| 46RH / 46RE | 1990–2003 | Ram 2500 gas V8 | Case tag | Hydraulic/electronic ID | High torque automatic |
| 47RH / 47RE | 1994–2002 | Ram 2500/3500 Cummins | Case tag | Tag + ECM match | Diesel-duty heavy transmission |
| 48RE | 2003–2007 | Ram diesel trucks | Side case tag | TCM + VIN scan | Reinforced 47RE successor |
| 45RFE | 1999–2005 | Jeep/Dodge trucks | Pan tag | Scan tool ID | 4-speed electronic auto |
| 545RFE | 2001–2013 | Ram 1500, Jeep | TCM + VIN | Electronic ID scan | 5-speed (6 ratios) |
| 65RFE | 2012–2018 | Ram 1500 | TCM software ID | Scan tool | Updated 545RFE version |
| 66RFE | 2011–present | Heavy gas Ram trucks | Electronic module | VIN + TCM ID | Heavy-duty 545RFE upgrade |
| 68RFE | 2007–present | Ram 2500/3500 diesel | Case tag + TCM | Scan tool + VIN | 6-speed heavy-duty diesel auto |
| W5A580 (NAG1) | 2005–2015 | Dodge Charger, Challenger, Jeep | Electronic TCM ID | Mercedes-derived scan tool | 5-speed automatic |
| ZF 8HP45 | 2012–present | Ram 1500, Jeep | TCM serial | VIN + scan tool | 8-speed automatic |
| ZF 8HP70 | 2013–present | Ram trucks, performance models | TCM ID | Electronic VIN decode | High torque 8-speed |
| ZF 8HP75 | 2019–present | New Ram 1500/Heavy-duty gas | TCM software ID | Scan tool | Improved 8HP70 variant |
| NV3500 (Manual) | 1989–2004 | Dakota, Ram 1500 | Case stamping | Physical ID on housing | 5-speed manual |
| NV3550 (Manual) | 2000–2004 | Jeep Wrangler, Dodge | Side case tag | Tag + casting number | Light-duty 5-speed manual |
| NV4500 (Manual) | 1992–2007 | Heavy-duty Ram trucks | Case stamping | Tag + VIN match | Strong diesel manual |
| NV5600 (Manual) | 1998–2005 | Cummins diesel trucks | Metal ID tag | Build tag decode | 6-speed heavy manual |
| A833 (Manual) | 1960s–1980s | Muscle cars, trucks | Case stamping | Casting ID | Classic 4-speed manual |
| A578 (Manual Diesel) | 1989–1993 | Early Cummins trucks | Case tag | Tag + VIN decode | Early heavy diesel manual |
| Getrag G56 (Manual) | 2005–2018 | Ram diesel trucks | Metal tag | VIN + tag ID | Modern 6-speed manual |
| NSG370 (Manual) | 2005–2018 | Jeep Wrangler, some Dodge | Case stamping | Scan tool + tag | 6-speed Mercedes manual |
Related Dodge Transmission Fluid Chart(For All Models)
How to Find Dodge Transmission Serial Number
Locating the transmission serial number is the first step before identification:
1. Transmission Case Tag
Most Dodge automatic transmissions have a metal tag bolted to the side of the transmission pan or case. This tag includes:
- Transmission model code
- Build date
- Serial or assembly number
2. Stamped Case Number
Some older transmissions (like A727, NV series) have numbers stamped directly into the metal housing. These may require cleaning the surface to read clearly.
3. VIN-Based Identification
Modern Dodge vehicles store transmission information in the Vehicle Identification Number (VIN). A scan tool or dealer database can decode:
- Transmission type
- Gear ratios
- Software calibration
4. Transmission Control Module (TCM)
In newer vehicles (especially 545RFE, 68RFE, ZF 8HP), the serial number is stored electronically in the TCM and accessed via diagnostic tools.
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Why Serial Number Identification Matters
Correct transmission identification is critical for several reasons:
- Prevents ordering the wrong replacement transmission
- Ensures correct fluid type and capacity
- Helps match the torque rating for engine compatibility
- Avoids costly rebuild mistakes
- Ensures correct electronic programming (TCM/ECU)
Even two transmissions that look identical externally (like 45RFE vs 545RFE) may have different internal gear ratios or software logic.
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Common Mistakes When Identifying Dodge Transmissions
Many people misidentify Dodge transmissions because:
- They rely only on engine size instead of transmission code
- They confuse RE and RH variants (hydraulic vs electronic control)
- They assume all 68RFE units are identical (they are not by year)
- They ignore VIN-based calibration differences
- They misread worn or dirty case tags
Always confirm using at least two methods: tag + VIN or tag + scan tool.
Quick Identification Tips
- Diesel Ram trucks (especially Cummins) almost always use 47RE, 48RE, or 68RFE
- Gas Ram 1500 commonly uses 45RFE or 545RFE
- Modern trucks (2013+) often use ZF 8-speed automatics
- Manual transmissions are usually NV or G56 series
- “RE” = electronically controlled overdrive
- “RH” = hydraulically controlled version (older systems)
Final words
Dodge transmission identification by serial number is the most accurate way to determine exactly what transmission your vehicle uses. Because Dodge has produced many variations of transmissions over the decades, ranging from classic A727 Torqueflite units to modern ZF 8-speed automatics, relying on external appearance alone is not enough.
By checking the transmission tag, stamped case number, VIN, or TCM data, you can confidently identify the correct model and ensure proper maintenance, repair, or replacement.
If you are working on a Dodge truck or SUV, always verify the serial number before purchasing parts or ordering a replacement transmission to avoid costly mistakes.
