Banks Power - Powertrain

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Products - Powertrain - Torque Converters
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Products - Powertrain - Engines
Browse by product — Engines

More About Powertrain

Banks Power: An Unmatched History of Victory

Our reputation has been forged in the heat of motorsports competition. Be it boating or land racing, open water or closed course, the dry lakes or the drag strip, Banks has always set the pace and has always set records. We put nearly 60 years of hard-won racing and testing knowledge and experience in your corner and provide the best products on the market. Power and endurance rarely go hand in hand, but with Banks products it’s an everyday occurrence. From climbing to all-out racing — gas or diesel — Banks has you covered!

Banks legendary performance reputation was first earned in the high-performance marine engine business in the '60s'. Since that time world, national, state, and local speed and endurance records have all fallen to Gale Banks Engines-equipped boats, trucks, cars and even a motorhome.

Now, applying the same engineering expertise that motivates the 1,200-horsepower Duramax 6.6L V-8 in their record-setting drag racing, and land speed record competition vehicles, Gale Banks Engines produces custom Duramax based advanced technology engines.

Non-slip three-friction-element clutch system & durable billet steel cover; delivers up to three times the torque capacity of stock. Improves acceleration; lowers transmission fluid temps; prolongs transmission life.

What does a torque converter do?

The torque converter could be the least understood part of the drivetrain — small wonder it’s so often ignored. In vehicles equipped with automatic transmissions, the torque converter is a fluid coupling that acts as a sophisticated clutch, allowing the engine to spin somewhat independently of the transmission. As engine speed changes, the torque converter determines how much — and how efficiently — torque is transmitted to the wheels.

Isn’t my stock torque converter good enough?

Your truck is equipped with a robust transmission that will withstand a typical diesel’s work and play. But kick it up a notch — by towing a heavy load or making frequent full use of power modifications — and the stock torque converter is the weak link that causes slippage, surging, poor braking, transmission shudder and excessive heat. Transmission longevity, fuel efficiency and torque output suffer. In these heavy-duty scenarios, you need a torque converter that’s built to take it.

Why a Banks Billet Torque Converter?

From its forged-steel billet cover to the furnace-brazed turbine and heavy-duty clutch, the precision and durability of every part of Banks Billet Torque Converter are unmatched. Banks aligns its stall speed to your engine’s torque peak to deliver formerly-wasted power to the wheels, and multiplies torque on acceleration for strength and responsiveness at take-off. With lower temperatures and higher efficiency, Banks prolongs transmission life and improves fuel economy. It’s this powerful combination of factors that lets your diesel do what you want it to.

The Anatomy of a Banks Power Billet Torque Converter Clutch

Forged-Steel Billet Front Cover

Banks replaces the stock cover stamped from low-carbon steel that’s prone to warp with a thick, single-piece cover CNC-machined from forged steel. Forging "networks" the natural grain for equal strength in all directions, so the cover remains uniformly flat under the extremes of force and heat. Unlike inferior covers that go by the name "billet," Banks does not weld a disc or ring to the sidewall, so there are no internal high spots caused by heat, or attachment posts that weaken with time.

Stock cover attaches to engine with welded posts

Banks machines connectors into forged-steel billet

Lockup Clutch

As velocity increases, transmission speed approaches engine speed, without quite catching up. Any difference in engine and transmission rates wastes power and fuel. A lockup clutch counters this inefficiency by locking the torque converter’s two halves together once they are up to speed. Banks’ heavy-duty lockup clutch is sized for maximum contact area, and utilizes a ceramic-carbon material that resists slipping, heat and wear far better than the factory’s cellulose material.

Stock paper-coated clutch surface wears away and slips

Banks’ ceramic-carbon clutch surface grips and lasts

Turbine Hub

The center of the turbine is where power transfers from the torque converter to the transmission’s input shaft. Banks replaces the factory-riveted hub that shifts and wears out with the firm hold and durability of a welded, hardened-billet spline.

Stock turbine shell’s cut-rate construction compromises fluid flow

Banks furnace-brazing streamlines flow and never leaks

Furnace-Brazed Turbine

Banks furnace-brazes the fins solidly onto the turbine shell, forming an integral piece, eliminating the loosening that occurs in standard "insert-and-bend" construction, and the warping common with welded fins. Banks’ method streamlines and seals the trans fluid’s flowpath, so the fluid moves faster and stays cooler, producing more power.

CNC-milled Stator

Banks’ stator is CNC-milled to exact an aggressive blade design that lowers "stall speed"—the point at which power is transferred from the engine to the transmission—so it coincides with the engine’s natural torque curve. The stock stator’s stall speed occurs from 2000 to 2500 rpm, well above a diesel’s torque peak. Banks makes the most of power and efficiency by matching the stall speeds to Dodge’s 1600-1900 rpm peak-torque window, and to Ford’s 1400-1900 rpm high-torque plateau.

Torrington Thrust Bearing

Where the factory uses a plastic washer, Banks supports the stator against the turbine with a Torrington sealed-roller bearing that stands up to heat without deforming or deteriorating.

Hardened Pump Drive

The back cover doubles as a centrifugal pump. Integral to the cover is a pump drive hub, which mates to the transmission. In stock form, this area tends to chip and crack. Banks overcomes the problem with a hardened pump drive that withstands twisting force. Finally, the complete torque converter is pressure tested to assure perfect sealing.

Stock hub cracks and wears

Banks’ hardened hub withstands massive torque

What About Multi-Clutch Torque Converters?

Some aftermarket companies sell torque converters with three clutches instead of one. While their units are larger and have more clutch surface, their features present drawbacks that they don’t tell you about:

  • Extra weight that drags down acceleration speed
  • Internal complexity that raises likelihood of malfunction
  • Overbuilt for all but specialty uses
  • Noise
  • Price!

Single-clutch torque converters do everything multi-clutch torque converters do, without the added bulk or cost … and no single-clutch torque converter out-competes Banks Billet Torque Converter in any category.


*Contents, features & performance results vary by application. Most products are CARB E.O. certified or in processs. Power measured at the rear-wheels, airflow improvements recommended.