2010 Dodge Challenger 3.5L NAG1 Transmission: Problems, Identification, and Used Replacement
Identify the 5-speed W5A580, understand common conductor plate and fluid contamination failures, and learn when to swap in a used OEM replacement.
- Always replace the 13-pin connector sleeve (Mopar P/N 68021352AA) during any service to prevent fluid leaks that can destroy the expensive Transmission Control Module (TCM).
- If the transmission is stuck in second gear (limp-home mode), the most common cause is a failed internal conductor plate, which can often be replaced without removing the entire transmission.
- Strictly use Mopar ATF+4 fluid meeting specification MS-9602; using generic or incorrect fluid types will cause shifting problems and can lead to premature failure.
- Before purchasing a used unit, confirm it is from a 3.5L V6 RWD Challenger, as NAG1 transmissions from other Chrysler vehicles are not interchangeable due to different bellhousings and internal components.
Identifying the 2010 Challenger 3.5L Transmission
The 2010 Dodge Challenger equipped with the 3.5L V6 engine uses a five-speed automatic transmission known as the NAG1. This transmission is also identified by several other names and codes, including W5A580, WA580, and 722.6. [19, 20] These names all refer to the same family of electronically controlled, rear-wheel drive transmission originally designed by Mercedes-Benz. [22] The "W5A580" designation breaks down as: W (uses a hydraulic torque converter), 5 (five forward gears), A (automatic), and 580 (its maximum torque capacity in Newton-meters). [19, 23]
How to Confirm Fitment on Your Vehicle
Before purchasing a replacement, you must verify that your vehicle has this specific transmission. A used unit from a 2010 Challenger with a 3.5L V6 is a direct fit. To confirm compatibility, check the following on your car:
- Engine: Ensure your Challenger has the 3.5L V6 engine, not the 5.7L/6.1L V8 or the later 3.6L Pentastar V6.
- Drivetrain: Confirm your vehicle is Rear-Wheel Drive (RWD).
- Transmission Type: Your shifter should indicate it is a 5-speed automatic, often featuring an "AutoStick" manual shifting mode. Do not confuse it with the 4-speed 42RLE.
- Visual Check: Look at the front passenger side of the transmission oil pan for a round, 13-pin electrical connector. This is a key feature of the NAG1 family. [23]
Warning: Not all NAG1 transmissions are the same. While Chrysler, Dodge, and Jeep used the NAG1 design in many vehicles (like the Chrysler 300, Dodge Charger, and Jeep Grand Cherokee), those units are not interchangeable with the one in the 3.5L Challenger. [3] They have different bellhousing bolt patterns to match other engines, different internal clutch capacities, gear ratios, and different tailhousings for other vehicle platforms.
Locating the Part Number
To be certain, you can match the part number stamped on your original transmission. Look for a raised metal pad on the driver's side (left side) of the transmission case, just above the oil pan rail. This pad will have a stamped Chrysler part number. Common part numbers for this specific transmission include:
| Common Part Numbers |
|---|
| 52109491AB |
| 5175491AC, 5175491AD, 5175491AE, 5175491AF |
| 52107907AB |
Common Failure Symptoms & Diagnosis
If your Challenger's transmission is failing, you may experience several distinct symptoms. A proper diagnosis from a qualified mechanic is essential, as some issues can be resolved without replacing the entire unit.
- Limp-Home Mode: The transmission gets stuck in a single gear (usually second gear) and will not shift up or down. [19] This is a classic sign of a failed conductor plate. 🎬 Watch: How to fix NAG1 transmission limp mode
- Harsh Shifting: You may feel a noticeable thump or metallic noise when the transmission shifts gears. [12] This can sometimes be addressed with a software update.
- Fluid Leaks: Puddles of red transmission fluid under the vehicle, especially near the front passenger side of the transmission, point to a leak from the 13-pin electrical connector sleeve. 🎬 See this step-by-step wiring adapter plug replacement
- Torque Converter Shudder: A vibration or shuddering feeling that occurs at steady speeds, which may feel like driving over rumble strips. This often points to fluid contamination or torque converter failure.
- Check Engine Light: The check engine light may illuminate, storing diagnostic trouble codes (DTCs) related to the transmission, such as P0700, P0730, P0743, or codes for speed sensor faults. [29, 37]
Diagnostic Flowchart
Known Issues, Recalls, and Service Bulletins
This transmission has several well-documented issues. Addressing these during installation of a used unit can prevent future failures.
Conductor Plate / Speed Sensor Failure
The internal conductor plate (also called a lead frame) contains the input and output speed sensors. When these sensors fail, the Transmission Control Module (TCM) loses critical data, forcing the transmission into limp-home mode. This is one of the most common severe failures for this unit. The remedy is to replace the conductor plate, which is located inside the transmission on the valve body. [7, 9]
| TSB Reference | Chrysler TSB 21-025-13 |
| Affected Years | All years with the NAG1 transmission. |
Electrical Connector Sleeve Leak
The 13-pin electrical connector plug has O-rings that degrade over time, causing transmission fluid to leak. This fluid can travel up the wiring harness (a process called wicking) and damage the external Transmission Control Module (TCM). This is a moderate but critical issue to fix.
Pro Tip: This is the single most important preventative maintenance item. Always replace the 13-pin connector sleeve (Mopar part #68021352AA) when installing a used transmission. The part is inexpensive and can save you from a very costly TCM replacement down the road.
Water Contamination & Torque Converter Shudder
On earlier models, water could enter the transmission through an unsealed filler tube, contaminating the fluid and causing the torque converter lock-up clutch to shudder. The fix involves a complete fluid flush, a new filter, and sealing the base of the fill tube.
| TSB Reference | Chrysler TSB 21-011-05 / TSB 21-003-06 |
| Affected Years | 2010 and earlier. |
Ignition Key and Shifter Binding
A recall was issued because the Wireless Ignition Node (WIN) module could allow the key to be removed when the shifter is not in Park. It could also cause the shifter to bind. The fix is performed by a dealer under the recall campaign.
| Recall Reference | NHTSA Campaign 10V198000 / Chrysler Recall K08 |
| Affected Years | 2010 |
Shift Quality Software Updates
Some vehicles may experience harsh shifts or set a P0730 (Incorrect Gear Ratio) code that can be resolved by updating the TCM software. A dealer or qualified shop with a wiTECH scan tool can perform this update.
| TSB Reference | Chrysler TSB 21-033-14 / TSB 21-017-15 |
Installation Gotchas & Required Tools
Installing this transmission is an advanced DIY job. Shop labor typically runs 4.5 to 8.0 hours, costing between $650 and $1,200. If you are tackling this yourself or hiring a shop, keep these critical points in mind:
Warning: The torque converter must be fully seated with three distinct clicks/drops. If it is not fully seated, you will crack the front pump gear when mating the transmission to the engine.
Warning: The 13-pin connector sleeve center 7mm bolt must NOT be over-tightened. The torque spec is only 2.5 Nm (22 in-lbs). Over-tightening will strip the brass nut inside the conductor plate, ruining it.
- Alignment: Ensure both engine block alignment dowel pins are in place to prevent crooked seating. The shifter linkage pin must also align perfectly with the manual valve on the valve body.
- Special Tools Required: You will need a Torx T30 socket, a 5mm Allen socket, and a 7mm socket. To check the fluid, you must use the Mopar Special Tool 9336 / 9336A (Transmission Fluid Dipstick Tool) along with an OBD2 Scan Tool or Infrared Thermometer to cross-reference the fluid temperature with a fill-height chart.
What Fails at Every Mileage Band
Pro Tip: The mileage bands below describe used replacement units of that mileage. The checklists are things to do WHILE INSTALLING the purchased engine, not maintenance for your current transmission.
Under 60,000 Miles
Even low-mileage units can suffer from age-related seal degradation. Torque converter shudder due to water contamination from a faulty fill tube O-ring is a known issue here. [1, 10] Premature failure of the conductor plate, leading to limp mode, can occur as early as 30,000-50,000 miles. [14, 24] The 13-pin electrical connector sleeve O-rings can also begin to leak. [1, 13]
- ✓Do during install (required): Replace the 13-pin electrical connector sleeve (Mopar P/N 68021352AA) and its O-rings to prevent future leaks. [13, 20] Perform a full fluid and filter change using licensed Mopar ATF+4. [1, 12]
- ✓Do during install (recommended): Inspect the transmission fill tube seal and apply RTV sealant at the base as a preventative measure against water intrusion. [10]
- ✓Cheap insurance while the engine is out: Replace the front pump seal (torque converter seal) while the transmission is out.
60,000 - 100,000 Miles
Conductor plate failure becomes much more common in this range, causing the vehicle to get stuck in gear (typically 2nd) and triggering limp mode. [11, 13, 24] Torque converter clutch (TCC) shudder and related issues become more prominent as the unit ages. [3] Fluid contamination from normal wear and tear becomes a significant factor if the unit has not been serviced. [9, 19]
- ✓Do during install (required): Replace the conductor plate as a preventative measure, as it is a primary failure point and accessible during installation. [11, 24] Replace the 13-pin electrical connector sleeve and O-rings. [13] Perform a complete fluid service with a new filter, pan gasket, and Mopar ATF+4 fluid. [9, 12]
- ✓Do during install (recommended): Replace the TCC solenoid and other valve body solenoids, as they are a common source of shudder and shifting issues. [3, 18]
- ✓Cheap insurance while the engine is out: Replace front and rear output seals.
100,000 - 150,000 Miles
Failures in this band are often linked to a lack of maintenance. Transmissions that haven't been serviced by this mileage are at high risk of failure due to fluid breakdown and filter clogging. [9, 19] Torque converter clutch shudder, slipping, and engagement issues are common complaints. [3] Conductor plate speed sensor failure due to accumulated metallic debris is highly likely if it has not been replaced. [11]
- ✓Do during install (required): Replace the conductor plate, all solenoids, and the 13-pin connector sleeve. [11, 13, 18] Perform a triple flush of the cooler lines and torque converter to remove all old, contaminated fluid. [10]
- ✓Do during install (recommended): Consider replacing the torque converter, as its internal clutches are likely worn and a source of contamination. [3, 9]
- ✓Cheap insurance while the engine is out: Replace all external seals and gaskets.
Over 150,000 Miles
At this mileage, failure is almost certain if the transmission has not been serviced regularly. [9] Internal hard part wear, such as clutch packs and bushings, is expected. [3] Complete failure requiring a rebuild or replacement is the most common outcome for poorly maintained units. [9, 23]
- ✓Do during install (required): A used unit in this mileage band should be considered a core for rebuilding, not a direct plug-and-play replacement. Plan for a complete professional rebuild, including all friction clutches, steels, seals, and bushings.
- ✓Do during install (recommended): Replace the torque converter, conductor plate, all solenoids, and the oil pump as part of the rebuild process. [3, 15]
- ✓Cheap insurance while the engine is out: N/A (Full rebuild assumed).
Real Owner Experiences
| Source | Mileage | What Happened | Cost |
|---|---|---|---|
| ~35,000 | An owner of a 2011 R/T reported developing odd shifting behavior, including clunking and shuddering, which led them to sell the vehicle. The dealership reported the transmission was 'operating as designed'. [21] | N/A | |
| PeachParts Forum | 30,000 | An ML320 owner with the same 722.6 transmission family reported needing a full rebuild at 30,000 miles of very easy driving. [14] | Rebuild |
| 60,000 | Performed preventative service (fluid, filter, connector) to avoid failure. | ~$140 for service parts | |
| Challenger Forum | 91,000 | A new owner of a 2014 Charger R/T was concerned about the transmission's health. The fluid was dark red but not burnt. Other owners with high-mileage NAG1s reported that performing a fluid and filter change at this mileage was successful and recommended. [12] | Preventative Maintenance |
| YouTube | 104,000 | A Jeep with a NAG1 transmission had burnt, brown fluid and fault codes for incorrect gear engagement and slipping. The technician concluded the transmission needed replacement due to a lack of service history. [19] | Full Replacement |
| YouTube | 120,000 | A video showed a transmission with heavily contaminated, non-red fluid and a clogged filter, emphasizing that lack of service leads to failure. The creator recommends a service every 60,000-80,000 miles. [9] | Transmission Service |
| Jeep Wrangler JK Forum | 137,000 km (~85,000 miles) | Owner experienced a P0743 TCC code and the transmission would not shift from 2nd to 3rd. The fluid was burnt and the pan magnet was heavily coated. Replacing the TCC solenoid alone did not fix the issue, indicating a more severe internal problem. [17] | Undetermined, requires transmission removal. |
| YouTube | ~200,000 | A technician diagnosed a complete NAG1 failure on a vehicle with over 200,000 miles that had never been serviced, stating the lack of maintenance was the direct cause of death. [9] | Full Replacement |
| PeachParts Forum | 275,000+ | Conversely, a technician reported knowing of a 722.6 transmission that went over 275,000 miles without a single fluid change and was still running, though this is considered an extreme outlier. [14] | N/A |
| YouTube Comment (Implied) | Not Stated | Owner mentions seeing people spend $5,000-$10,000 on new transmissions when the actual issue was a bad battery causing electrical faults. | $5,000 - $10,000 |
Repair or Replace?
Deciding whether to repair your current transmission or replace it entirely depends on the specific failure. Some issues are external or easily accessible, while others require a complete teardown.
When Repair Makes Sense
| Repair Scenario | Estimated Cost |
|---|---|
| 13-Pin Electrical Connector Sleeve Leak This is a mandatory and inexpensive preventative repair. It should be done immediately if leaking, or during any transmission service. Ignoring it can lead to fluid wicking into the expensive Transmission Control Module (TCM), causing a much costlier failure. The part itself is very cheap. [23, 24, 34] |
$150 - $400 |
| Conductor Plate / Speed Sensor Failure When the transmission goes into 'limp mode' but otherwise functions mechanically. This is a common electronic failure. The conductor plate contains speed sensors and can be replaced by dropping the valve body without removing the entire transmission. Parts cost between $80 and $270. [2, 3, 6, 7] |
$500 - $900 |
| Torque Converter Shudder If the shudder is the only symptom and there is no evidence of widespread internal damage (like metal in the pan). The repair involves replacing the torque converter, which requires removing the transmission. Labor is the main cost. A standalone torque converter replacement can cost between $600 and $1,000. [31, 32, 33] |
$800 - $1,500 |
When Replacement is Smarter
Replacement with a quality used or remanufactured unit is the better choice when there are signs of major internal mechanical failure, such as loud grinding noises, multiple shifting problems, or significant metal debris found in the transmission pan. If the cost of diagnosing and repairing multiple issues (e.g., a bad torque converter AND a failing clutch pack) approaches or exceeds the price of a warranted replacement unit, replacement is more economical. Used units typically run $1,200 to $2,200, while remanufactured units range from $2,900 to $4,300.
Questions to Ask Your Installer
Before handing over your vehicle, ask your mechanic these questions to ensure they know this specific transmission:
- Have you worked on the Chrysler/Mercedes NAG1 (W5A580) transmission before?
- Will you be replacing the 13-pin connector sleeve with a new OEM part (Mopar 68021352AA) regardless of whether the old one is leaking?
- How will you verify the torque converter is fully seated (the 'three clicks' method)?
- Do you have the special dipstick tool (Mopar 9336) and the temperature chart to set the fluid level correctly?
- Will you be using licensed Mopar ATF+4 fluid and a new filter/gasket?
- What is your process for flushing the transmission cooler and lines to prevent contamination of the replacement unit?
- Does your quote include resetting the transmission's adaptive memory with a scan tool after installation?
Freight & Delivery Reality
If you are ordering a used transmission online, understand that it will not arrive in a cardboard box via standard parcel delivery. A used NAG1 transmission assembly weighs approximately 186 lbs and measures roughly 41" x 26" x 25" before crating. It ships as LTL (Less Than Truckload) freight strapped to a wooden pallet.
Because of its size and weight, delivery to a residential address will require a truck equipped with a liftgate to lower the pallet to the ground. Always inspect the transmission for physical damage (such as cracked bellhousings or broken sensors) before signing the driver's delivery receipt. A reputable supplier will also conduct a pre-purchase verification interview with you to confirm your vehicle is a 3.5L V6, RWD, 5-speed automatic before shipping to ensure you get the exact right part.
Frequently Asked Questions
What fluid does the 2010 Challenger 3.5L transmission use?
This transmission requires Mopar ATF+4 (meeting specification MS-9602). [25, 32] Do not use generic multi-vehicle fluid or fluid intended for Mercedes-Benz versions of this transmission (e.g., Shell ATF 134), as Chrysler applications are specifically calibrated for ATF+4. [26] Using the wrong fluid is a common mistake that can cause shifting problems and long-term damage. [32]
Does a used transmission need to be programmed?
While the vehicle may operate without it, performing a TCM Adaptive Relearn (Drive Cycle Adaptation) is highly recommended. This procedure, done with a professional or dealer-level scan tool like Mopar wiTECH, resets the learned shift adaptations and allows the TCM to learn the characteristics of the replacement unit for optimal shift quality. [24] It is not a full ECU remarriage, but a necessary calibration step.
How much does this transmission weigh?
A used NAG1 transmission assembly weighs approximately 186 lbs before being crated for shipping. It is shipped on a pallet via LTL freight, not as a standard parcel.
What is included with a used NAG1 transmission?
A standard used assembly typically includes the transmission case, internally lubricated parts, extension/tail housing, transmission oil pan, torque converter, internal conductor plate, and solenoids. It generally does NOT include external sensors, the wiring harness, the Transmission Control Module (TCM), shifter assembly, shift linkage, cables, flexplate, external cooler lines, or a new 13-pin electrical connector plug sleeve.
Why is my transmission stuck in second gear?
This is known as "limp-home mode." The transmission locks into a single gear to prevent further mechanical damage when the computer detects a critical fault. In the NAG1, this is most frequently caused by a failure of the speed sensors located on the internal conductor plate.
How do I check the fluid level?
The NAG1 does not come with a traditional dipstick. You must use a special tool (Mopar Special Tool 9336 / 9336A). The fluid level is highly dependent on temperature, so you must use an OBD2 scan tool or infrared thermometer to read the fluid temperature, then cross-reference that temperature with a specific fill-height chart. Never check the fluid cold, and never leave the special dipstick tool inside the fill tube permanently.
Helpful Videos
Technical Specifications
OEM Part Numbers: 52109491AB 5175491AC 5175491AD 5175491AE 5175491AF 52107907AB
Model Name: NAG1; Alternate Names: W5A580, WA580, 722.6; Type: 5-Speed Automatic; Drivetrain: Rear-Wheel Drive (RWD); Engine Application: 3.5L V6; Max Torque Rating: 580 Nm; Fluid Type: Mopar ATF+4 (MS-9602); Weight (Dry): ~186 lbs
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Dodge Challenger:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Identifying the 2010 Challenger 3.5L Transmission
- How to Confirm Fitment on Your Vehicle
- Locating the Part Number
- Common Failure Symptoms & Diagnosis
- Diagnostic Flowchart
- Known Issues, Recalls, and Service Bulletins
- Conductor Plate / Speed Sensor Failure
- Electrical Connector Sleeve Leak
- Water Contamination & Torque Converter Shudder
- Ignition Key and Shifter Binding
- Shift Quality Software Updates
- Installation Gotchas & Required Tools
- What Fails at Every Mileage Band
- Under 60,000 Miles
- 60,000 - 100,000 Miles
- 100,000 - 150,000 Miles
- Over 150,000 Miles
- Real Owner Experiences
- Repair or Replace?
- When Repair Makes Sense
- When Replacement is Smarter
- Questions to Ask Your Installer
- Freight & Delivery Reality
- Frequently Asked Questions
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