PONTIAC 6000 Automatic Transmission 400-00108A TH125

( Manufacturer Part Number: 6000 ), ( Part Type: Transmission ), ( Conditions Options: At, Fwd, Nrt ), ( Genuine Oem: Yes ), ( Ipn: 400-00108a ), ( Manufacturer Warranty: 60 Day )

Review PONTIAC Automatic Transmission Gasoline 6000 fits 1982–1984

The **Pontiac 400-00108A Automatic Transmission (TH125, 6000 Series, 1982 1984)** is a robust and meticulously engineered component designed to deliver seamless power transfer in select Pontiac vehicles from the early 1980s. This transmission is a part of the legendary **TH125** family, renowned for its durability and smooth operation in full-size trucks and muscle cars like the Pontiac Firebird, Trans Am, and GTO, as well as the full-size Catalina and Bonneville models. Built to handle the demands of high-torque applications, the **400-00108A** features a **6000-series torque converter**, which is a critical upgrade over earlier models, offering improved efficiency and better heat dissipation for extended performance under heavy loads. The transmission itself is a **three-speed automatic** with a robust planetary gearset, precision-balanced shafts, and a reinforced housing designed to withstand the stresses of aggressive driving, towing, or prolonged use in demanding conditions.

Under the hood, this transmission operates with a **hydraulic valve body** that ensures smooth shifting between first, second, and reverse gears, while the **TH125 s** robust torque converter paired with a **6000-series stator and pump assembly** enhances torque multiplication, providing a strong launch and responsive acceleration. The **400-00108A** is equipped with a **sealed and lubricated rear main seal**, a **front pump seal**, and a **rear output shaft seal**, all of which are designed to minimize leaks and extend the transmission s lifespan. The **shift linkage and selector mechanism** are engineered for precise operation, allowing for effortless upshifts and downshifts, even under load. This transmission also features a **built-in torque converter clutch**, which engages at higher speeds to improve fuel efficiency while maintaining power delivery.

For those restoring or maintaining a classic Pontiac from the early '80s, the **400-00108A** is a highly sought-after replacement part due to its compatibility with a range of engines, including the **350 cubic inch V8** and **400 cubic inch V8** powerplants, which were staples in Pontiac s performance lineup. The transmission s **cast aluminum housing** is reinforced with high-strength steel components, ensuring structural integrity and resistance to warping over time. Additionally, the **TH125 s** reputation for reliability makes it a favorite among enthusiasts who prioritize both performance and longevity. Whether installed in a muscle car for drag strip action or in a daily driver for dependable power delivery, this transmission is a testament to Pontiac s engineering prowess of the era, offering a blend of strength, smoothness, and timeless durability. Proper installation, regular fluid changes, and maintenance will ensure that this transmission continues to perform flawlessly for years to come.

### **Pros and Cons of Buying a 1982-1984 Pontiac 400 with TH125 Automatic Transmission (VIN 00108A, 6,000 miles)**

#### **Pros**

1. **Reliability of the TH125 Transmission** The TH125 is a robust three-speed automatic transmission known for durability, especially when properly maintained. It is less prone to major failures compared to some later automatic transmissions, provided it has been serviced regularly.

2. **Strong Engine Performance** The Pontiac 400 (350 CID V8) in this era is a well-built, high-torque engine when in good condition. With proper maintenance, it can provide solid power for daily driving or light towing.

3. **Classic Muscle Car Appeal** The Pontiac 400 is a well-regarded muscle car from the early '80s, offering a balance of performance and practicality. It holds value reasonably well among enthusiasts, especially if it has a clean title and good documentation.

4. **Lower Mileage for the Era** At 6,000 miles, this vehicle is extremely low-mileage for its age, suggesting it has been well-preserved or stored properly. This reduces concerns about major wear-and-tear issues.

5. **Potential for Modifications** The Pontiac 400 platform allows for various upgrades, including performance tuning, suspension modifications, or even engine swaps (e.g., a LS engine), making it a good candidate for restoration or customization.

6. **Availability of Parts** As a mid-'80s muscle car, parts are still relatively accessible, though some specialty items may require sourcing from collectors or online marketplaces.

7. **Potential for Low Ownership Costs** If the transmission, engine, and drivetrain are in good shape, maintenance costs could be modest compared to modern vehicles with complex electronics.

---

#### **Cons**

1. **Age and Wear** Despite the low mileage, a 40 year-old vehicle will eventually require significant maintenance. Rust, worn suspension components, and aging electrical systems are common concerns.

- **Slipping gears** (often due to worn clutches or torque converter issues).

- **Leaking seals or fluid contamination** (leading to rough shifting or failure).

- **Solenoid or valve body failures** (if the transmission has been neglected).

A thorough inspection of the transmission fluid and internal condition is critical.

3. **Rust and Structural Corrosion** Early '80s Pontiacs, especially those driven in snowy or humid climates, are prone to rust. Check the frame rails, wheel wells, and undercarriage for structural integrity.

4. **Electrical System Reliability** Older vehicles often suffer from failing alternators, starters, or wiring issues. The ignition system (points or distributor) may also need replacement if not already updated.

5. **Fuel and Emissions Compliance** This vehicle may not meet modern emissions standards, which could complicate registration or insurance in some states. A smog check may be required, and modifications (like an EGR delete) could be necessary.

6. **Seating and Interior Wear** The interior may show signs of aging, including cracked dashboards, worn seats, or failing upholstery. While not critical for function, it could affect comfort and resale value.

7. **Insurance Costs** Classic muscle cars can be expensive to insure, especially if they are not properly documented as "classic" or "restoration" vehicles. Shop around for specialized insurers.

8. **Resale Value Uncertainty** While Pontiacs hold value among enthusiasts, the market for these cars is niche. If you plan to sell later, the resale value may not justify the purchase price unless it is a well-documented project car.

- **Worn or leaking power steering/hydraulic systems**.

- **Suspension components (ball joints, bushings, shocks)** that may need replacement.

- **Exhaust or emissions system failures**.

10. **Fuel Economy** As a V8 engine, this vehicle will not be fuel-efficient by modern standards, consuming around 12-15 MPG in mixed driving.

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### **Ending Conclusion**

Buying a 1982-1984 Pontiac 400 with a TH125 transmission and only 6,000 miles is an intriguing opportunity, but it comes with both significant advantages and notable risks. The low mileage suggests the vehicle has been well-preserved, which is a major plus. The TH125 transmission is a strong point, and the 350 V8 engine is capable of providing reliable power if maintained. However, the age of the vehicle means that rust, electrical issues, and potential transmission or drivetrain wear are real concerns that must be addressed.

This car could be an excellent **project vehicle** for an enthusiast willing to invest time and money into restoration, or it could serve as a **daily driver** if thoroughly inspected and maintained. If you are looking for a **low-maintenance, modern replacement**, this is not the right choice. But if you appreciate classic muscle cars and are prepared for the challenges of owning an older vehicle, it could be a rewarding purchase provided you conduct a **comprehensive inspection** before buying.

---

### **Recommendation**

1. **Get a Professional Pre-Purchase Inspection (PPI)** Hire a mechanic experienced with classic Pontiacs to thoroughly inspect the transmission, engine, suspension, and electrical systems. This is non-negotiable for a vehicle of this age and rarity.

2. **Verify Maintenance Records** Ensure the transmission fluid has been changed regularly (TH125s require fluid changes every 30,000-50,000 miles). Ask for proof of service, especially for the transmission and engine.

3. **Check for Rust and Structural Issues** Inspect the frame, subframe, and major components for rust or weakness. A lift or hoist may be needed to examine the undercarriage.

- **Transmission shifting** (should be smooth with no hesitation or slipping).

- **Engine performance** (no unusual noises, smooth acceleration).

- **Suspension and handling** (no excessive play or clunks).

- **Electrical systems** (lights, horn, accessories should function properly).

5. **Consider a Transmission Fluid Change** If the fluid is dark, burnt, or has metal particles, the transmission may need servicing or even rebuilding.

- **Transmission rebuild or fluid service** ($300-$1,500 ).

- **Suspension components** ($200-$800).

- **Electrical upgrades** (alternator, starter, wiring) ($100-$500).

- **Rust repairs or bodywork** (varies widely).

- **Exhaust or emissions modifications** (if needed).

7. **Decide on Your Intent**

- **If you want a reliable daily driver**, ensure the vehicle is in excellent condition and consider modernizing some systems (e.g., alternator, starter, fuel system).

- **If you want a project car**, be prepared for a multi-year restoration and enjoy the process of bringing it back to peak condition.

8. **Negotiate Based on Inspection Findings** Use the PPI report to negotiate the price downward if significant issues are found.

### **Final Verdict**

This Pontiac 400 is a **great candidate for an enthusiast** who is willing to put in the work to restore or maintain it. However, it is **not a plug-and-play vehicle** for someone seeking a hassle-free classic car. If you are prepared for the challenges and have the budget to address potential issues, it could be an excellent addition to your collection. If you are looking for a vehicle with minimal upkeep, consider a more modern classic or a well-documented project car with a known service history.

Details:

CELEBRITY 84 AT; TH125, gasoline. 6000 84 AT; TH125, gasoline. CIERA 84 AT; TH125, gasoline. CENTURY 84 AT; TH125, gasoline.

part #: 400-00108a prices

• $25.00-$339.88

specifications autotransmissionsgo:

• for makes: Pontiac
• for years: 1982-1984
• mpn: 6000
• part type: Transmission
• conditions options: At, Fwd, Nrt
• genuine oem: Yes
• ipn: 400-00108a
• manufacturer warranty: 60 Day

offer autotransmissionsgo:

• quantity: 1
• sold: 0
• started: February 9, 2026
• availability: In Stock
• options: Ship-to-home
• best offers: True

payments autotransmissionsgo:

• credit card: Visa
• other
• wallet: Paypal

seller autotransmissionsgo:

• city: Pueblo, Colorado
• rating: 98.9%
• # reviews: 449

returns autotransmissionsgo:

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

shipping autotransmissionsgo:

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

general autotransmissionsgo:

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

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