MAZDA 03-70LE Automatic Transmission Jdm 4CYL 8238

( Manufacturer Part Number: 03-70LE ), ( Type: Automatic Transmission ), ( Country Of Origin: Japan ), ( Performance Part: No ), ( Manufacturer Warranty: 30-days From Delivery Date )

Review MAZDA 4cyl Automatic Transmission Jdm fits MIATA B6 RWD 1999–2000

The **1999-2000 Mazda MX-5 Miata (NA) 4-cylinder Automatic RWD (JDM B6 8238)** is a refined yet spirited interpretation of the legendary roadster, blending effortless driving dynamics with the convenience of a smooth-shifting automatic transmission. Built upon Mazda s proven **B6 platform**, this model retains the iconic rear-wheel-drive layout and lightweight construction that define the Miata s character, delivering a nimble, responsive, and engaging driving experience. The **1.8L DOHC 16-valve inline-four engine**, producing a modest yet spirited **128 horsepower** and **110 lb-ft of torque**, offers a balanced blend of power and efficiency, making it equally capable of spirited city driving or leisurely highway cruising. The automatic transmission, paired with a **multi-mode shift strategy**, ensures seamless gear changes while maintaining a natural, engaging feel ideal for those who appreciate the convenience of an auto without sacrificing the Miata s playful nature.

Under the hood, the **B6 engine** is a well-tuned, fuel-injected powerplant with a **double overhead camshaft design**, delivering smooth power delivery and a satisfying exhaust note that grows more pronounced as RPMs climb. The **5-speed automatic transmission**, featuring a **torque converter** and **electronic shift logic**, adapts intelligently to driving conditions, whether you re merging on the highway or navigating tight urban streets. The **RWD configuration** ensures precise handling, with the weight distribution favoring the rear wheels by approximately **40/60**, allowing the Miata to carve through corners with confidence while still offering a stable, composed ride.

Inside, the cabin remains true to the Miata s minimalist yet functional philosophy. The **cloth upholstery**, **steel-pedal shifter**, and **recaro-style bucket seats** (available in the **Miata Sport Package**) provide a sporty yet comfortable seating experience, while the **manual climate controls** and **simple, analog instrumentation** keep the focus on driving. The **steering wheel**, though slightly less sporty than the manual version, still offers a firm, feedback-rich feel, and the **power-assisted rack-and-pinion steering** ensures effortless maneuverability in tight spaces. The **JDM (Japanese Domestic Market) trim** often includes subtle differences such as **unique badging, a slightly different color palette**, and sometimes **additional sound insulation**, enhancing the driving experience with a quieter cabin and a more refined interior ambiance.

Externally, the **1999-2000 Miata** retains the **timeless NA design language** sharp creases, a **low, wide stance**, and **pop-up headlights** that add to its retro charm. The **14-inch alloy wheels** (often **5-spoke designs** in the JDM market) complement the sporty aesthetic, while the **sport-tuned suspension** (with **adjustable dampers** in some trims) ensures a balanced ride that prioritizes handling over extreme comfort. The **rear spoiler** (standard on later models) adds a touch of sportiness, and the **blacked-out lower body panels** (common in JDM versions) give it a sleek, aggressive look. Whether parked in a driveway or cruising along a scenic coastal road, the Miata s **aerodynamic efficiency** and **low wind noise** make it a joy to own and drive.

For enthusiasts seeking a **unique blend of practicality and performance**, the **automatic Miata** is an excellent choice offering the **effortless drivability** of an automatic while still retaining the **playful, rear-wheel-drive character** that defines the MX-5. The **B6 engine s reliability**, combined with the **automatic transmission s smooth operation**, makes it a **low-maintenance yet engaging** daily driver, perfect for those who want a **fun, stylish, and efficient** roadster without the complexity of a manual. Whether you re commuting to work, taking a weekend road trip, or simply enjoying a leisurely drive, this **1999-2000 Mazda MX-5 NA Automatic** delivers a **timeless blend of sportiness and sophistication** that continues to captivate drivers decades after its introduction.

### Pros and Cons of Buying a 1999-2000 Mazda MX-5 Miata (NA2) 4-Cylinder Automatic (RWD, JDM B6 8238)

---

#### **Pros**

1. **Affordability and Value**

The 1999-2000 MX-5 NA2 is a well-established model with a strong aftermarket, making parts and maintenance relatively inexpensive compared to newer sports cars. JDM (Japanese Domestic Market) versions like the B6 8238 are often sold at a lower price than their U.S.-spec counterparts due to import restrictions and availability.

2. **Lightweight and Agile Handling**

The Miata s rear-wheel-drive layout and compact, lightweight design (especially in the NA2 generation) provide exceptional nimble handling and a direct driving experience. The open-top design enhances the connection with the road, making it ideal for spirited driving.

3. **Reliability (When Maintained Properly)**

The 1.8L or 1.6L 4-cylinder engines in the NA2 are known for their durability if regularly serviced. The automatic transmission (a 4-speed Aisin unit) is also robust, though it requires more attention than a manual. Many examples with low mileage and proper maintenance can easily exceed 200,000 miles.

4. **Simple and Accessible Maintenance**

The NA2 s mechanical simplicity means that basic repairs (e.g., brake jobs, suspension work, or engine tune-ups) are straightforward and cost-effective. Many mechanics are familiar with the platform, and DIYers can find ample resources online.

5. **Aftermarket Support**

The Miata has a vast aftermarket, including performance parts (e.g., suspension upgrades, exhaust systems, and engine modifications), as well as cosmetic enhancements (e.g., body kits, wheels, and interior upgrades). JDM parts can sometimes be harder to source but are often cheaper than their NA or NB counterparts.

6. **Driving Enjoyment**

The Miata s understeer-prone yet forgiving chassis and the growl of the 4-cylinder engine make it a joy to drive, whether on twisty roads or backroads. The automatic transmission, while not as engaging as a manual, is smooth and adequate for casual driving.

7. **Fuel Efficiency**

The 1.8L engine in the NA2 averages around 22-26 MPG (combined), which is efficient for a sports car. The automatic transmission doesn t hurt fuel economy significantly compared to a manual.

8. **Classic Status and Community**

The NA2 Miata is a beloved classic, with a strong owner community that provides support, forums, and events. This makes it easier to find help, parts, and like-minded enthusiasts.

9. **JDM Advantages**

- **Lower Price:** JDM models are often sold at a discount due to import regulations in the U.S.

- **Potential for Customization:** Some JDM-specific parts or modifications may be unique or cheaper than their NA counterparts.

- **No Emissions Restrictions:** JDM cars are not subject to U.S. emissions laws, which can simplify modifications or restorations.

---

#### **Cons**

1. **Automatic Transmission Limitations**

The automatic transmission in the NA2 is not as engaging as a manual, which is a significant drawback for enthusiasts who prioritize driving dynamics. The Aisin 4-speed automatic can also be less responsive than modern transmissions, leading to a less sporty feel. Additionally, automatic Miatas are less desirable in the collector market, which could affect resale value.

2. **Higher Maintenance Needs**

- **Transmission Fluid:** Automatic transmissions need fluid changes every 30,000 50,000 miles to prevent wear. Neglecting this can lead to costly repairs.

- **Clutch (if converted to manual):** If you plan to convert the automatic to a manual, the clutch and flywheel will need attention, adding to upfront costs.

- **Suspension:** The NA2 s suspension is basic and wears out over time. Bushings, shocks, and control arms may need replacement as the car ages.

- **Rust:** Especially in the JDM version, rust can be an issue in the subframe, wheel wells, and floor pans if the car was driven in wet or salty conditions.

3. **Reliability Concerns with Mileage**

- **Engine Wear:** The 1.8L engine can develop oil leaks (valve cover gasket, oil pan gasket) or timing chain stretch over time.

- **Transmission Slippage:** The automatic transmission can develop slippage or rough shifting if fluid isn t changed regularly.

- **Exhaust and Emissions:** JDM cars may have rusted exhaust systems or catalytic converters that fail, requiring replacement.

4. **Less Power Than Manual or Later Models**

The automatic NA2 produces less power than the manual version (128 hp vs. 140 hp in the U.S. spec) due to the torque converter s efficiency. Later models (NB or NC) offer more power and modern refinements, which the NA2 lacks.

5. **JDM-Specific Challenges**

- **Import Restrictions:** While JDM cars are legal in the U.S., they may require additional paperwork or inspections (e.g., smog compliance in some states).

- **Part Availability:** Some JDM-specific parts (e.g., unique body panels, interior trims) may be harder to find than NA parts.

- **Potential Modifications:** If the car has been heavily modified for the JDM market (e.g., different exhaust, suspension, or engine tuning), these changes may not be as practical or legal in the U.S.

6. **Resale Value**

Automatic Miatas, especially older NA2 models, hold their value poorly compared to manuals. If you plan to sell later, a manual conversion (if feasible) could improve resale potential.

7. **Comfort and Practicality**

The NA2 is a two-seater with minimal storage space. Its basic interior lacks modern amenities like power windows, air conditioning (common in JDM models), or cruise control, which can be a drawback for daily use.

8. **Weather Limitations**

As a soft-top, the Miata is impractical in rain or cold weather unless equipped with a hard top or convertible top. JDM models may lack factory tops or have aftermarket options that are less reliable.

---

### **Conclusion**

The 1999-2000 Mazda MX-5 NA2 automatic (JDM B6 8238) is an excellent choice if you prioritize **affordability, lightweight handling, and driving enjoyment** while accepting some compromises. It s ideal for enthusiasts who want a fun, low-maintenance sports car for spirited driving without the complexity of a manual or the cost of a newer model. However, if you plan to use it daily or want better resale value, a manual NA2 or a later model (NB/NC) might be more practical.

The automatic transmission is the biggest trade-off, as it reduces the car s sportiness and requires more attention to fluid changes. If you re comfortable with regular maintenance and don t mind the limitations of an automatic, this Miata can be a fantastic purchase. For those who want a more engaging driving experience or plan to keep the car long-term, a manual NA2 or a manual-converted automatic would be preferable.

---

### **Recommendation**

- You want a **budget-friendly, fun-to-drive sports car** with minimal daily practicality needs.

- You re okay with **regular maintenance** (especially transmission fluid changes) and don t mind the automatic s limitations.

- You prioritize **lightweight handling and simplicity** over power or modern amenities.

- You plan to **modify or customize** the car and don t mind sourcing some JDM-specific parts.

- You re driving in **mild weather** and don t need a hard top.

- You want a **daily driver** with comfort features like A/C, power windows, or cruise control.

- You prefer **manual transmission** for a more engaging driving experience.

- You re not willing to **budget for maintenance** (transmission, suspension, rust repairs).

- You plan to **keep the car long-term** and want better resale value (a manual NA2 or NB/NC would be smarter).

- You live in an area with **harsh winters or frequent rain**, as the soft top and basic interior may be impractical.

- If you love the NA2 but want a manual, look for a **1999-2005 NA2 manual** (preferably with low mileage and service records).

- For a more modern Miata, consider a **2006 NB or NC model**, which offers better power, reliability, and features.

- If you re open to other JDM cars, a **Toyota MR2 (A140) or Honda S2000** might offer a similar driving experience with different trade-offs.

Details:

Non-performance engines/transmissions .E. Application: 1.8L 4cyl BP Engine. Accessories Included: Torque Converter, Sensors, Shift Solenoids if shown in photos. Driver will not back up onto your property to unload.

Warranty void if transmission is disassembled, modified, or improperly installed. Some external sensors or mounts may need to be swapped from your original unit. Guaranteed low-mileage authentic JDM transmissions imported directly from Japan. Origin: Directly Imported from Japan JDM Spec.

Prior to the engine/transmission being shipped back us, we require photos. Model No: 03-70LE. Condition: Used JDM imported automatic transmission in excellent working order. Each transmission is inspected, drained, and cleaned before shipping.

Fluid drained and unit tested prior to shipping. Condition: Used JDM Import Low Mileage. External accessories such as manifold, valve cover, distributors, coil packs, ignites, alternators, AC compressors, power steering pumps, oil/water fuel rails, injectors, turbochargers, superchargers, seals, oil pans, solenoids, clutches, flywheels, flex plates, sensors, and torque converters are NOT covered under warranty. Specifications: Transmission Code: SB12 Automatic RWD.

Mileage: 50,000 75,000 miles. Engine and/or transmission must be shipped back complete as it was when received.

part #: 0370le prices

• $559.00-$749.00

specifications autotransmissionsgo:

• for models: B6, Rwd, Miata
• for makes: Mazda
• for years: 1999-2000
• mpn: 03-70le
• type: Automatic Transmission
• country of origin: Japan
• performance part: No
• manufacturer warranty: 30-days From Delivery Date

general autotransmissionsgo:

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

seller autotransmissionsgo:

• city: Belleville, New Jersey
• rating: 100.0%
• # reviews: 646

payments autotransmissionsgo:

• other
• credit card: Discover
• wallet: Google-pay

shipping autotransmissionsgo:

• service: Flat Rate Freight
• cost: $0.00
• class: Freight
• type: Fixed

offer autotransmissionsgo:

• sold: 0
• started: April 10, 2026
• availability: In Stock
• quantity: 1
• options: Ship-to-home

returns autotransmissionsgo:

• time: 30 Days
• paid by: Buyer
• policy: Returns Accepted

Mazda 03-70LE Is Similar To:

• 01 Mazda Tribute Automatic Transmission (55.4% similar) Install new filter kit. Clear all transmission computer codes prior to starting or operating vehicle. Adjust throttle position sensor cable. 4X4, id YL8P-FB mazda tribute 01 at this engine comes with a 90 day part only warranty. Replace oil pan gasket and rear main seal. Engines are guaranteed ...(September 3rd, 2017)
• Escape Mazda 03 Automatic 101819 3.0l 04 4x2 Ford 3l8pga Transmission Tribute (45.3% similar) After install, change transmission fluid at proper intervals in accordance with vehicle manufacturer guidelines. 4X2 mazda tribute. Replace or flush cooler and lines in accordance with the vehicle manufacturer guidelines, including any current technical service bulletins that apply. Daytime phone ...(November 18th, 2014)
• 5 06 Automatic 102602 Transmission Mazda (49.6% similar) No expedited shipping is available. If an item arrives damaged, please via message within 24 hours for instructions...(November 11th, 2014)
• 01 02 MAZDA MX-5 MIATA AUTOMATIC TRANSMISSION 10559 127K A103 (22.4% similar) Read the carefully and take a close look at the photo prior to buying...(March 29th, 2014)
• Automatic 2.3l Transmission 108491 04 05 Mazda 3 (43% similar) 3,AOD,CLEAN FLUID,110K this part will fit these makes and model's with these options mazda. If an item arrives damaged, please within 24 hrs for instructions. No expedited shipping is available. N new part manufactured from scratch...(May 12th, 2015)
• TRANSMISSION MAZDA 2 1099699 11 12 13 1.5L AT 18K (23% similar) Our transmissions come with a 120 day parts only warranty. This is a parts replacement warranty only. Warranty requirements: install new filter kit replace front seals replace axle seals some trans axles have two separate fills for the final drive and transmission-fill both flush & inspect ...(April 3rd, 2014)
• 117637 Mazda 03 04 6 Automatic Transmission 6-181 3.0l 5 Speed (56.3% similar) 03 04 mazda 6 automatic transmission 5 speed mazda 6/0 3. No expedited shipping is available. 0,TESTED drove this part will fit these makes and model's with these options mazda 6/0 4...(December 24th, 2015)
• Cx-9 1216432 Mazda Automatic Transmission 08 09 Fwd (48.4% similar) Some of our listings may use the best offer feature. Transmission type manual or auto, and the body type 2 door, 4 door, 5 door hatch, etc. This includes all requests for visual identification on a part such as a verification of the part number that is printed on the part or photo requests see below...(September 3rd, 2014)
• 123 01-02 Mazda B-3000 Automatic (38.1% similar) This 2002 ranger had miles at time of dismantle. Body exterior interior engine transmission steering suspension electrical cooling mazda B-3000 automatic residential address - load is curbside delivery only someone over 18 must be present for. Some listings include a warranty and others do not. ...(April 19th, 2017)
• 97 Mazda Transmission 96 1343004 Manual 626 (37.9% similar) It has higher miles and or light damage, not as nice as an a or b part. If an item arrives damaged, please within 24 hrs for instructions. Good used manual transmission. B r auto ships via ups ground. No expedited shipping is available...(July 26th, 2015)
• 137742 Mazda 03 04 05 06 07 08 6 Manual Transmission 6-181 3.0l (45.6% similar) There is no guarantee for labor to install or remove any parts what so ever unless agreed upon before sale. If a problem occurs contact a sales agent prior to any work. Warranty does not cover any seals. These are used parts so some may have signs of wear like dirt,grease,rust,corrosion,...(March 26th, 2016)