5000HP 1971 Plymouth GTX Transmission Guide

Are you looking to build or restore a 1971 Plymouth GTX capable of handling insane horsepower? Building a 5000HP 1971 Plymouth GTX is a monumental task, and the transmission is one of the most critical components. This guide provides a detailed look at the best transmission options, considerations, and upgrades necessary to handle that kind of power. We'll cover everything from the stock components to the high-performance solutions that will keep your GTX running strong. In our experience, choosing the right transmission is the key to harnessing all that power and enjoying a thrilling ride.

Choosing the Right Transmission for Your 5000HP GTX

The stock transmission in a 1971 Plymouth GTX was never designed to handle 5000 horsepower. Therefore, selecting a suitable high-performance transmission is paramount. Several options are available, each with its strengths and weaknesses. — Fred's Journey With The Brazil National Team: A Detailed Look

Automatic Transmission Options

• TH400: A popular choice for high-horsepower applications. It's robust and can be built to handle immense power. You'll need an adapter plate to fit it to the Mopar engine. In our testing, the TH400 has proven to be incredibly reliable in various high-performance builds.
• Powerglide: Often used in drag racing, the Powerglide is known for its simplicity and strength. It typically only has two forward gears, which may not be ideal for street driving. However, if your primary focus is drag racing, it's a strong contender.
• 727 Torqueflite (Upgraded): While the original 727 isn't up to the task, heavily modified versions can handle significant power. This option allows you to retain a Mopar transmission but requires extensive internal upgrades like billet shafts and high-performance clutches.

Manual Transmission Options

• Tremec T56 Magnum: This is a strong choice. It’s a modern six-speed manual transmission that can handle substantial horsepower. Adapters are available to make it work with your Mopar engine.
• Jerico/Liberty: These are purpose-built racing transmissions designed to withstand extreme abuse. They are often used in professional racing applications but might be overkill for a street-driven GTX.

Key Considerations When Choosing a Transmission

• Torque Capacity: The most critical factor. Ensure the transmission is rated to handle the torque output of your engine. Always exceed the horsepower and torque ratings.
• Gear Ratios: Consider your intended use. Drag racing requires different gear ratios than street driving. A transmission with a wide range of gear ratios will make your GTX more versatile.
• Reliability: Choose a transmission known for its reliability, especially if you plan to drive your GTX frequently. Research user reviews and forums to gauge the reliability of different models.
• Cost: The price varies greatly depending on the transmission type and modifications. Factor in the cost of the transmission itself, the adapter plates (if required), and installation.

5000HP 1971 Plymouth GTX Transmission Upgrades

Regardless of the transmission you choose, certain upgrades are essential to ensure it can handle 5000HP. These upgrades are vital to ensure that your transmission survives the experience.

Torque Converter

A high-stall torque converter is crucial. It allows the engine to rev up into its powerband before engaging the transmission. Choose a converter matched to your engine's power curve and intended use (street vs. strip).

Valve Body

A performance valve body improves shift firmness and speed. It optimizes fluid pressure and timing, resulting in quicker and more positive shifts. This upgrade makes a massive difference in how your car performs. — Mavericks Vs. Rockets: Where To Watch

Clutch Packs and Steels

Upgrading to high-performance clutch packs and steels provides increased holding capacity and durability. Billet steel components are a must for high-horsepower builds. These upgraded components can withstand the brutal forces produced by the engine.

Input and Output Shafts

Replace the stock input and output shafts with heavy-duty, billet shafts. These are significantly stronger than the factory shafts and can withstand the extreme torque. You're building a serious machine; don't skimp on this.

Transmission Cooler

A high-capacity transmission cooler is necessary to prevent overheating, especially under heavy use. Proper cooling ensures the longevity of the transmission. Consider adding a fan to the cooler for extra cooling power. — Stylish Diaper Bags For Dads: The Ultimate Guide

Transmission Installation and Tuning

Professional Installation

While some enthusiasts prefer DIY projects, installing a transmission capable of handling 5000HP is best left to professionals. A skilled mechanic with experience in high-performance transmissions will ensure the job is done correctly.

Tuning

Proper tuning is essential. The transmission must be calibrated to work with your engine's power output and the overall vehicle setup. This may involve adjusting shift points, line pressure, and other parameters.

Maintaining Your High-Performance Transmission

Regular Fluid Changes

Change the transmission fluid and filter regularly. This keeps the transmission clean and operating efficiently. Follow the manufacturer's recommendations for fluid type and service intervals.

Inspection

Regularly inspect the transmission for leaks, unusual noises, or shifting problems. Catching issues early can prevent major failures.

Preventative Maintenance

Consider adding an auxiliary oil filter to further protect your transmission. Avoid excessive stress on the transmission, such as aggressive launches, until it's fully warmed up. This will greatly increase the transmission's lifespan.

Frequently Asked Questions (FAQ)

Q: What is the best transmission for a 5000HP 1971 Plymouth GTX? A: There is no single