What Do Turbo 350 Gear Ratios Mean? Is It The Best?

If you are looking for a reliable and versatile transmission for your classic car, truck, or rally racer, consider the Turbo 350. It has a reputation for being strong, compact, and easy to modify.

In my blog, you will learn about the Turbo 350 gear ratios, how they affect performance, and how to choose the best one for your vehicle.

Read on to learn more about the Hydra-Matic division of general motors below!

What Is Turbo 350 Gear Ratios?

turbo 350 gear ratios

Turbo 350 gear ratios tell you how fast the performance transmission is. They change how your vehicle accelerates, reaches top speed, and uses gas.

Any difference in layout would work better for different situations and tastes.

For instance, a lower gear ratio (2.52 in 1st gear ratio) gives you more power and quicker acceleration but lowers your top speed and gas mileage.

A higher gear ratio (like 1.0 in third gear) gives you less control and slower acceleration but raises your top speed and gas mileage.

These operations are supported with a direct clutch drum. Knowing the Turbo 350 gear ratios lets you pick the best transmission for your vehicle or change it to fit your needs.

Detailed Turbo 350 Gear Performance

Which 350 turbo transmission specs make this gear to become a product of improved fuel economy for you to try

It may be because of a wide variety of worthwhile aftermarket conversions.

You can identify the features of the lockup converter by connecting it with an electrical plug on the driver seat’s side.

We will discover three concerns about the 350 Turbo hydramatic transmission performance below:

Specs Of Turbo 350 Transmission Gear

The Turbo Hydra-Matic Division of 350 has three gears and no overdrive. In particular:

  • 1st gear ratio: 2.52 to 1
  • 2nd gear ratio: 1.52 to 1
  • 3rd gear ratio: direct drive, i.e., 1.0 to 1
  • Reverse: 2.07 to 1

The Turbo 350 is also a classic American muscle transmission. It has:

  • Three performance levels: Level 2, Level 3, and Level 4
  • Up to 700 horsepower
  • Up to 400 lb-ft. of torque

The Turbo 350 uses some parts from the Turbo Hydra-Matic 400 and the Buick Super Turbine Powerglide, including the lockup torque converter. 

For example, Mid-80’S Chevrolet C10 Pickups applied the Turbo 350 gear, then replaced it with the 700R4.

The other famous brands also cover Turbo 350 and Turbo 400 gear ratios in their engines.

This allows you to have a varied option list for you to select different deep gears when you intend to have 2-3 gear changes through the shifter flexibly.

Turbo 350 Gear Construction

The Turbo 350 transmission is a one-piece wonder with bellhousing patterns that connect to the engine.

You can use this benefit to improve the bolt-on output shaft and require sun gear. Its material is cast from aluminum, making it light and durable.

The TH350 was evaluated as the biggest difference from its predecessor. It had extra gear that made it better from the start.

Almost all rear-wheel drive vehicles from General Motors used the TH350, including the Corvette, Chevelle, and Nova.

You also consider the output shaft housing mating to get proper commercial vehicle applications if you want to try more from the first band adjuster.

Many vintage cars still use Turbo 350 transmission builders today. It is not an outdated torque converter.

Turbo 350 Gear Size

When you monitor the Turbo 350 weight, the electronic version is shaped in a one-piece aluminum alloy case that is 21.75 inches long and weighs about 120 lbs.

It also has a special oil pan that fits well and a notch on the back right side.

It would help to have about 4 quarts of fluid for the TH350 pan and more for the torque converter. With a 9.5″ converter, you need about 10 quarts to operate your car effectively.

Benefits Of Turbo 350 Gear

th350 gear ratios

You don’t need the best car or the most power to enjoy your hobby. You need the Turbo 350. It is a 3-speed automatic transmission that Chevrolet and Buick made from 1969 – 1986 GMC.

It is strong, compact, and easy to modify.

According to Novak Conversions – an expert in Jeep drivetrain conversions, the TH350 gear performance is the strongest automatic transmission you can try in all kinds of Jeep.

The Turbo 350 has an extra gear that makes it faster and smoother than its predecessor. With proper modifications in this gear, you can handle up to 700 horsepower and 400 lb-ft of torque.

If you want to experience a Dexron HP or Dexron VI with it, contact a fixed center for a deeper suggestion about this demand.

The Turbo 350 is the perfect choice for beginners and enthusiasts alike. Remember to consider clutch assemblies, concentric shafts, and fuel pumps to have the best product.

Don’t miss this opportunity to upgrade your gear’s performance for fuel efficiency!

Which Cars Match The TH350 First Gear?

The Turbo 350 Transmission works well with many GM vehicles, such as GMC trucks, Pontiac Firebirds, Monte Carlo, Chevrolet Camaros, and the Caprice.

Its original version can fit GM cars with small-block V-8s, small Iron Duke 4-cylinders, big-block 396 V-6s, and V-8s.

The BOP – Oldsmobile, Buick, and Pontiac is a different version of the Turbo 350 that fits the Pontiac V8. You can tell them apart by looking at the block flange.

The BOP has a valley, and the Chevrolet has a peak, which allows you to have HD applications on them flexibly.

General Motors also made some variations of the Turbo 350, such as lock-up torque converters with the smaller TH 250, TH20, and TH375.

Which Engines Are Compatible With Turbo 350 Gear?

If you want to use Turbo 350 gear in your car, you need to ensure your engine is compatible. Some of the machines that can work with Turbo 350 gear are:

  • Chevrolet small and large block engines, either V6 or V8
  • I6, an in-line engine with six cylinders in a single line
  • Duke I4, a four-cylinder engine
  • Buick Super Turbine Powerglide, a two-speed automatic transmission
  • Turbo 400, a three-speed automatic transmission
  • Pontiac V8, an eight-cylinder engine

These engines can fit the Turbo 350 transmission, which has an integrated bellhousing with the Chevrolet 90-degree engine bolt pattern. 

Therefore, you can choose any kind of them to provide the operating ability of the Turbo 350 gear, even when you have aftermarket applications.


4l60e final drive ratio

Which Common Problems About Turbo 350 Gear?

Some common problems with Turbo 350 gear are delayed or erratic shifts, slipping, noise, and no drive in either the “D” or “R” position.

Low transmission fluid levels, vacuum modulator valve leaks, blown modulators, loose bolts, dirt or debris in the valve body, or a plugged filter can cause these problems.

Are All Versions Of Turbo 350 Transmissions The Same In Construction?

No, not all versions of Turbo 350 transmissions are the same in construction.

There are different variants of the Turbo 350, such as the TH350-C, which has an electronic lock-up converter, and the TH375, a beefed-up Buick version.

The transmissions also vary in clutch pack and band specifications.

Is The Turbo 350 and TH350 The Same?

Yes, the Turbo 350 and the TH350 have the same transmission.

They are both short names for the Turbo-Hydramatic 350, an auto-shift valve body, a three-speed transmission that was introduced by GM in 1969.


You can get some basic meanings of Turbo Hydra-Matic Name of Turbo 350 gear ratios.

The TH350 performance can be compatible with other four-speed automatics in some situations if you have a circular-style iron adapter on your current model.

This gear is highly recommended for fuel efficiency and passenger car usage.

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