DODGE TRUCK TDOD250 Automatic Transmission 400-02421 8-360 150

( Brand: Dodge Truck ), ( Manufacturer Part Number: TDOD250 ), ( Part Type: Transmission ), ( Conditions Options: At, 5.9 ), ( Genuine Oem: Yes ), ( Ipn: 400-02421 ), ( Descriptionpartcondition: Our Parts Are Recycled Oem And Come From Salvaged Vehicles. Since ), ( Manufacturer Warranty: 6 Month )

Review DODGE TRUCK Automatic Transmission Model's 150 Pickup fits 4WD 1990–1992

The **Dodge 400-02421 Automatic Transmission (830/831/832/833/834/835/836/837/838/839/840/841/842/843/844/845/846/847/848/849/850/851/852/853/854/855/856/857/858/859/860/861/862/863/864/865/866/867/868/869/870/871/872/873/874/875/876/877/878/879/880/881/882/883/884/885/886/887/888/889/890/891/892/893/894/895/896/897/898/899/900/901/902/903/904/905/906/907/830-831-832-833-834-835-836-837-838-839-840-841-842-843-844-845-846-847-848-849-850-851-852-853-854-855-856-857-858-859-860-861-862-863-864-865-866-867-868-869-870-871-872-873-874-875-876-877-878-879-880-881-882-883-884-885-886-887-888-889-890-891-892-893-894-895-896-897-898-899-900/901/902/903/904/905/906/907)** specifically the **400-02421 model designed for 4WD applications in Dodge vehicles from the 1990 to 1992 model years (150 series)** is a robust and meticulously engineered transmission that delivers the power and durability required for off-road adventures and heavy-duty towing. This transmission is part of the legendary **TorqueFlite family**, renowned for its smooth shifting, exceptional torque capacity, and reliability in both on-road and off-road scenarios. The **400-02421** is built with a **three-speed automatic design**, featuring a **planetary gearset** that ensures efficient power transfer while maintaining a compact yet sturdy construction. Its **8-speed torque converter** (with a **360-pound-foot torque capacity**) is a standout feature, allowing it to handle substantial power outputs from high-performance engines without sacrificing performance or longevity. The transmission s **4WD-specific design** incorporates reinforced components, including a **heavy-duty output shaft** and **strengthened bearings**, to withstand the increased stress of four-wheel-drive applications. The **hydraulic valve body** is precision-machined to deliver seamless gear engagement, reducing wear and tear while ensuring optimal fuel efficiency. This transmission is particularly well-suited for **Dodge Ram 150 models** from the early '90s, offering a perfect balance between power delivery and durability. Whether hauling heavy loads, navigating rough terrain, or simply providing a smooth driving experience, the **400-02421** stands as a testament to Chrysler s engineering prowess, ensuring that your vehicle remains reliable and responsive for years to come. Its **universal compatibility** with select Dodge and Ram models from the era makes it a sought-after upgrade or replacement part for enthusiasts and mechanics alike.

### **Pros and Cons of Buying a Used Dodge 400 (02421) Automatic Transmission (4WD, 8-360, 1990-1992, 150,000 miles)**

#### **Pros**

1. **Proven Durability** The 400 4-speed automatic transmission (02421) was a robust unit designed for heavy-duty applications, including trucks, vans, and SUVs. Many examples from the early '90s have lasted well beyond 150,000 miles with proper maintenance.

2. **Strong Towing and Hauling Capability** The 8-360 engine paired with this transmission was built for work, making it ideal for towing trailers, hauling heavy loads, or off-roading in 4WD configurations.

3. **Availability of Parts** As a classic transmission, parts (gaskets, seals, solenoids, bands, etc.) are still widely available, though some may require sourcing from specialty suppliers.

4. **Modifiable and Upgradable** Enthusiasts have successfully rebuilt and upgraded these transmissions with modern components, improving performance and longevity.

5. **Lower Purchase Price** Compared to newer transmissions, a used 400 in this condition is relatively affordable, making it a cost-effective option for budget-conscious buyers.

6. **Off-Road and 4WD Suitability** The 4WD version is well-suited for rugged use, making it a practical choice for overlanding, farming, or light off-roading.

7. **Potential for Long-Term Reliability** With proper care, some of these transmissions have exceeded 200,000 miles, especially in applications where they were never pushed to extreme limits.

---

#### **Cons**

1. **Aging Design Limitations** The 400 transmission is a torque converter-based automatic, which means it relies on fluid pressure and mechanical linkages rather than modern electronics. This can lead to sluggish shifting or failure if fluid is neglected.

2. **Fluid and Filter Maintenance Required** The transmission fluid must be changed regularly (every 30,000 50,000 miles) to prevent sludge buildup, which can damage internal components. Many owners skip this, leading to premature wear.

3. **Band and Clutch Wear** The 400 uses friction bands and clutches that wear out over time. If the transmission has not been rebuilt, these may be near failure, causing rough shifting or complete lockup.

4. **Electrical and Solenoid Issues** Older transmissions rely on solenoids and relays that can fail over time, leading to shifting problems or complete transmission failure if not addressed.

5. **Rebuild Costs Can Be High** While parts are available, a full rebuild (including new bands, clutches, seals, and gaskets) can cost **$1,500 $3,000 **, depending on labor rates and whether the engine is also being worked on.

6. **Limited Modern Support** Unlike newer transmissions with diagnostic trouble codes (DTCs), diagnosing issues in a 400 often requires mechanical knowledge, a scan tool (if available), or trial-and-error testing.

7. **Potential for Hidden Damage** Without a thorough inspection (or a rebuild history), there may be internal damage (worn bearings, cracked housings, or seized components) that isn t immediately obvious.

8. **Fuel Efficiency Concerns** The 8-360 is a heavy-duty engine, meaning it consumes more fuel than modern alternatives, which could be a drawback for daily driving.

---

### **Ending Conclusion**

The **Dodge 400 (02421) automatic transmission in a 1990-1992 4WD vehicle with 150,000 miles** can be a **great choice** if you prioritize **durability, towing capacity, and off-road capability** but only if you are prepared for **maintenance, potential rebuild costs, and the need for mechanical knowledge**. It is **not a plug-and-play transmission** for casual buyers; it requires **regular fluid changes, inspections, and possibly a rebuild** to ensure long-term reliability.

If you plan to **use it for work, hauling, or light off-roading** and are willing to invest time in maintenance, this transmission can be **extremely rewarding**. However, if you seek **ease of use, modern reliability, or frequent towing**, a **rebuilt or modern transmission** (such as a **TorqueFlite 700R4, Allison, or a contemporary AOD/T56**) may be a better long-term investment.

---

### **Recommendation**

- You have **mechanical experience** or are willing to learn.

- You **plan to use it for heavy-duty work, towing, or off-roading**.

- You **budget for fluid changes, inspections, and potential rebuilds**.

- You **find a vehicle with a clean service history** (or are prepared to rebuild it).

- You **prefer a classic, no-frills transmission** over modern alternatives.

- You **expect trouble-free operation** without maintenance.

- You **don t have access to transmission repair skills or tools**.

- You **need a vehicle for daily commuting** without heavy loads.

- You **cannot afford rebuild costs** if issues arise.

- You **prefer a more modern, electronically controlled transmission**.

**Final Verdict:** This transmission is **best suited for enthusiasts, farmers, or off-roaders** who appreciate **old-school durability** and are willing to put in the effort. For most casual buyers, a **rebuilt 400 or a newer transmission** would be a safer bet. Always **inspect the fluid, test drive for shifting issues, and consider a pre-purchase inspection** before committing.

Details:

Exchange attached accessory items to insure proper fit mounts, intake manifold, exhaust distributor, sensors. Insure this engine is the same application as one being replaced. On crankshaft bolts that are drilled through sealant must be applied to avoid leaks. Insure the cooling system is flushed and functioning properly.

Whats Not Included?, No warranty is provided for any such parts that are attached, including as switches, sensors, cables, injectors, electronics, belts including timing belt, hoses, water pumps, gaskets, oil pans, Timing Covers, Fuel Rails, solenoids, manifolds, etc. DODGE 150 PICKUP 92 AT, 4x4 W model's ; 8-360 5.9L. Disable fuel/ignition before attempting to start engine. Warranty Hassle Free 6-Month Warranty: Whats Included.

Inspect and replace gaskets seals front seal, rear main valve cover gaskets, oil pan. All other parts that may be provided are Accessories and Extra Parts. Replace the timing belt. This will allow the oil to prime as indicated by manufacturer.

Drain excess oil and coolant from exhaust system. Replace engine oil, oil filter, air fuel filters, coolant-antifreeze. All engines are guaranteed as long block only. Replace water pump.

Exchange the flywheel and bolts. If equipped with an engine oil cooler the radiator or external must be replaced. Install new thermostat gasket. Remove all cap-plugs orifice covers.

60-day return period begins on the day part is delivered. Clear all computer diagnostic codes from the vehicle prior to installing. Shipping is included to any location with a commercial or residential address lift gate included, in the Lower 48 USA. Install replacement spark plugs wires.

part #: tdod250 prices

• $506.71-$1850.00

specifications autotransmissionsgo:

• for models: 4wd
• for makes: Dodge
• for years: 1990-1992
• brand: Dodge Truck
• mpn: Tdod250
• part type: Transmission
• conditions options: At, 5.9
• genuine oem: Yes
• ipn: 400-02421
• descriptionpartcondition: Our Parts Are Recycled Oem And Come From Salvaged Vehicles. Since
• manufacturer warranty: 6 Month

seller autotransmissionsgo:

• rating: 99.9%
• # reviews: 957
• city: Ontario, Oregon

general autotransmissionsgo:

• Car Truck Parts Accessories > Transmission Drivetrain > Automatic Transmission
• condition: Used

offer autotransmissionsgo:

• availability: In Stock
• sold: 0
• options: Ship-to-home
• quantity: 1
• best offers: True
• started: February 25, 2026

payments autotransmissionsgo:

• credit card: Discover
• other
• wallet: Paypal

returns autotransmissionsgo:

• policy: Returns Accepted
• paid by: Buyer
• time: 60 Days

shipping autotransmissionsgo:

• type: Fixed
• class: Freight
• service: Flat Rate Freight
• cost: $50.00

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