10 Best Ati Turbo 400 2026

⚡ Quick Verdict

📋 How We Evaluated

Evaluations focus on build quality, material resilience, and installation ease. We also consider compatibility with standard TH400 configurations and overall value for performance enthusiasts.

Series	1350
Spline	32
Compatibility	TH400/4L80E
Warranty	1 Year

What We Found

The KeleHD slip yoke is a high-strength component essential for any TH400 or 4L80E transmission build. It is engineered to the 1350-series standard, which is the gold standard for high-torque applications. With a 32-spline count and precise machining, it ensures a secure, vibration-free connection between the transmission and the driveshaft.

The hub diameter and bearing cap dimensions are held to tight tolerances, ensuring compatibility with performance-grade driveshafts. This yoke is designed to handle significantly more power than stock components, making it a critical upgrade for anyone pushing their vehicle’s performance limits.

It includes a one-year warranty, reflecting the manufacturer’s confidence in the product’s durability.

Who It’s For

This slip yoke is for serious performance builders and drag racers. If you are upgrading your drivetrain to handle high horsepower, this 1350-series yoke is a necessity. It is the reliable link between your TH400 transmission and your custom driveshaft.

Material	Rubber & Steel
Thickness	3/16 inch
Compatibility	TH400/3L80
Design	Steel Shim Insert

What We Found

This transmission oil pan gasket is a significant upgrade for the GM Turbo 400. It features a high-durometer vulcanized rubber construction reinforced with a steel shim, which prevents the common deformation issues found in standard cork or paper gaskets.

At 3/16 inches thick, it ensures a tight, consistent seal that effectively stops transmission fluid leaks. The gasket is designed to match the dimensions of the Moroso 93103, making it a reliable replacement for both stock and aftermarket pans.

Its ability to maintain a seal under varying temperatures makes it ideal for high-performance applications. The inclusion of the steel shim ensures the gasket remains stable and does not blow out under pressure.

Who It’s For

This gasket is for any TH400 owner tired of persistent transmission leaks. It is perfect for those who want a long-lasting, reliable seal that can withstand the heat of performance driving. If you are performing a transmission service, this is a must-have upgrade for peace of mind.

Piping	2.75″/2.25″
Material	Stainless Steel
Vehicle	EVO X
Type	Cat-Back

What We Found

The Borla 140285 exhaust system provides a tailored solution for the Mitsubishi EVO X. It uses specific piping diameters of 2.75 inches and 2.25 inches to optimize exhaust gas flow.

Borla is known for high-quality stainless steel construction, which ensures the system resists corrosion and maintains structural integrity under high heat. This cat-back setup is designed to improve engine breathing, potentially unlocking more power and providing a deeper, more aggressive exhaust note.

The fitment is engineered specifically for the 2.0L turbo engine, ensuring that all hangers and flanges align correctly with the vehicle’s chassis. It represents a premium upgrade for those seeking reliable performance gains and improved aesthetics.

Who It’s For

This exhaust system is for EVO X owners who want to improve flow and sound. It is perfect for enthusiasts looking for a bolt-on performance upgrade that does not require complex fabrication. If you value brand reputation and long-lasting stainless steel quality, this system is a prime choice.

Capacity	40 oz
Treats	400 Gallons
Key Benefit	Lubricity/Cetane
Compatibility	All Diesel

What We Found

The Archoil AR6500 serves as a comprehensive diesel fuel treatment designed to enhance engine longevity and performance. It focuses on increasing lubricity, which is essential for protecting sensitive fuel system components like high-pressure pumps.

The additive also includes a detergent package to clean injectors, restoring proper spray patterns for better atomization. By boosting the cetane level, it helps engines achieve smoother combustion and quicker ignition.

The 40 oz bottle is highly concentrated, treating up to 400 gallons of fuel, which offers great long-term value for heavy-duty users. It is compatible with all diesel engines, making it a versatile tool for maintaining efficiency in trucks and equipment.

Who It’s For

This treatment is perfect for diesel owners who want to extend the life of their fuel system. It is ideal for those driving in cold climates or using older engines that benefit from improved cetane levels.

If you want to maintain peak fuel economy and protect your investment from premature wear, this additive is a smart addition to your maintenance routine.

Compatibility	TH350/TH400/700-R4
Fitment	Direct OEM
Material	High-Strength Steel
Function	Shift Linkage

What We Found

This bracket and lever kit is designed to restore factory-like shifting for various GM transmissions including the TH350 and TH400. It is a direct-fit replacement, meaning it adheres to OEM specifications to ensure smooth operation and proper gear selection.

The kit uses premium materials to resist the harsh environment under the vehicle, where heat and road debris are common. By replacing worn linkage components, this kit eliminates sloppy shifting and ensures that your transmission gear selection remains precise.

It is a simple, cost-effective solution for anyone experiencing difficulty shifting gears in their classic GM vehicle or performance build.

Who It’s For

This kit is for classic car owners or builders using a TH350/TH400 transmission. It is ideal for those who notice play in their shifter linkage or have difficulty selecting gears accurately. If you want to restore smooth, factory-grade shifting, this kit is the perfect fix.

Length	29.5 inch
Material	Stainless Steel
Compatibility	TH350/TH400
Seal	Double O-Ring

What We Found

This stainless steel transmission dipstick tube offers a durable, aesthetic upgrade for TH350 and TH400 transmissions. The 29.5-inch length is sufficient for most engine bay configurations, and the stainless steel braided hose provides excellent flexibility and heat resistance.

A double O-ring seal at the base ensures the unit remains leak-free, protecting your transmission fluid levels. The firewall-mounted design allows for a clean look in the engine bay while making it much easier to check fluid levels compared to the stock location.

The stainless steel construction also prevents rust, ensuring the dipstick remains easy to handle and view over many years of service.

Who It’s For

This is perfect for car builders who want a cleaner engine bay and easier maintenance. If you are tired of burnt hands or difficult access when checking your transmission fluid, this firewall-mounted upgrade provides the functionality and look you need.

Part Number	631GC5153AM5
Application	Mack E7-400
Years	1994-2002
Type	Turbocharger

What We Found

The 631GC5153AM5 turbocharger is a specific replacement part for the Mack Truck E7-400 engine. It is built to meet the rigorous demands of heavy-duty diesel engine operation. The turbocharger features robust construction to handle the high heat and pressure cycles typical of these engines.

As a direct-fit replacement, it simplifies the repair process for mechanics working on older Mack equipment. The unit is designed to provide consistent boost and reliability, ensuring that the engine maintains its power output.

Because it is a specialized component, checking the part number against your engine’s specific requirements is critical to ensuring proper performance and avoiding installation errors.

Who It’s For

This part is for heavy-duty diesel mechanics or Mack Truck owners performing engine repairs. It is specifically for those maintaining the E7-400 engine series. If you need a reliable, factory-spec replacement to get your truck back on the road, this unit is the correct choice.

Mounting	Firewall
Compatibility	TH350/TH400
Material	Flexible Steel
Color	Black

What We Found

This firewall-mounted dipstick features a flexible design intended for easy access in tight engine bays. The construction utilizes high-quality materials to resist heat and provide consistent, accurate readings for TH400 transmissions. It effectively replaces damaged OEM units while offering a cleaner, more accessible maintenance point.

The black finish provides a stealthy aesthetic, and the clear scale markings allow for quick checks during routine maintenance. By focusing on durability, the unit handles the vibrations and heat associated with performance-oriented vehicles.

Overall, it serves as a straightforward, functional upgrade for owners tired of struggling with hard-to-reach factory dipsticks in cramped engine compartments.

Who It’s For

This product suits enthusiasts performing transmission maintenance who prioritize accessibility. It is ideal for those with crowded engine bays where reaching the factory dipstick is difficult. If your build includes a custom engine setup, this flexible, firewall-mounted solution makes routine fluid level checks significantly faster and more convenient.

Horsepower	Up to 400 HP
Wheel	Billet Aluminum
Bearings	Copper Alloy
Compatibility	1.5L-2.5L Engines

What We Found

This maXpeedingrods turbocharger is a versatile unit capable of supporting up to 400 horsepower for 1.5L to 2.5L engines. It features an upgraded billet compressor wheel, which is lighter and more aerodynamically efficient than standard cast wheels. This results in faster boost response and better overall engine efficiency.

The turbo also utilizes a high-temperature resistant silicon-molybdenum turbine housing, allowing it to handle the extreme heat of turbocharged operation. The copper alloy journal bearings are designed for durability and ease of maintenance, making this a practical choice for street-driven project cars.

It is a comprehensive performance upgrade that balances power potential with robust construction.

Who It’s For

This turbo is for enthusiasts building a street-performance engine on a budget. It is ideal for 4-cylinder or 6-cylinder imports where space is limited but power gains are desired. If you want an efficient, modern-design turbocharger for your project car, this unit offers significant potential.

Compressor	Forged Aluminum
Housing	Ductile Iron
Compatibility	BMW i6
Warranty	1 Year

What We Found

This maXpeedingrods turbocharger kit offers a budget-friendly way to introduce forced induction to various BMW i6 engines. The kit features a forged aluminum compressor wheel designed for better airflow and boost response. The turbine housing uses ductile iron, which provides necessary thermal resistance for high-heat environments.

It includes standard T3/T4 flange patterns, making it compatible with many aftermarket manifolds. While designed as an entry-level performance product, it includes a one-year warranty to offer some peace of mind.

The kit is aimed at DIY builders who are comfortable with the custom fabrication often required for turbocharging naturally aspirated engines. It is a comprehensive package for the price.

Who It’s For

This kit is for budget-conscious BMW owners looking to add turbo power. It suits those who have the technical skill to handle the complex installation and tuning required for a turbo conversion. If you are building a project car and want an affordable starting point, this kit offers decent value.

What to Look For Before Buying

Choosing the right transmission parts requires a clear understanding of your power goals. I look for high material quality and exact fitment to avoid frequent repairs. These considerations will help you select durable parts for your specific build.

Check Verify Compatibility

Always cross-reference part numbers with your transmission model. Even minor changes can cause fitment issues. Never assume parts are universal just because they share a name.

Value Prioritize Material Quality

Performance builds generate heat that destroys cheap parts. Look for stainless steel, vulcanized rubber, or billet aluminum. These materials resist corrosion. Spending more on quality saves money on future repairs.

Rating Assess Performance Ratings

Check the power ratings of drivetrain components like slip yokes. Ensure the part matches your engine output. Using a component below your power level leads to failure.

Verify Consider Installation Requirements

Assess your mechanical skill before buying. Many upgrades require fabrication or professional tuning. Ensure you have the necessary tools or a shop ready.

Frequently Asked Questions

What is the best way to ensure my TH400 does not leak?

The most effective method is using a high-quality, steel-shimmed rubber gasket. Always ensure your pan surface is perfectly clean before installation.

Does a firewall-mounted dipstick improve performance?

It does not add horsepower, but it improves maintenance efficiency. Easier access encourages more frequent fluid checks, preventing damage.

Why is a 1350-series slip yoke recommended?

The 1350-series provides superior strength compared to stock yokes. It handles high torque without failing, which is vital for racing.

Can I install a turbo kit myself?

You can if you have mechanical experience and fabrication tools. Most kits require custom lines, and professional tuning is mandatory for safety.

How do I know if a part fits my GM transmission?

Always check the transmission model, such as TH400. Verify the spline count and flange patterns. Contact the manufacturer if you are unsure.

🎯 Final Verdict

For any serious Best ATI Turbo 400 build, the KeleHD Slip Yoke is the clear top pick. Its 1350-series construction provides the unmatched strength needed to handle high-torque output reliably.

For those focused on transmission maintenance, the runner-up oil pan gasket is a must-have to prevent leaks and ensure long-term durability. Both components are essential for protecting your transmission investment. Whether you are building a drag racer or a high-performance street car, start with these core components.

Visit the product pages today to secure these vital upgrades for your build.