This LencoDrive 2-speed transmission with reverse is a high-performance, torque converter-driven automatic transmission designed for racing applications. This particular unit comes equipped with a 25-gear set, a combination flow pneumatic shifter, a lockout shifter, and a titanium Bohr/Boninfante bell housing. It also features a pressure port directly to the valve body for precise transmission pressure readings.

Key Features and Specifications

• Gear Set: This LencoDrive unit includes a 25-gear set. Lenco transmissions utilize various gear ratios, with options such as 1.25% which uses compound 25 and 29 tooth planet gears, a 25 tooth sun gear, and a 76 tooth ring gear. The planetary design allows for an underdrive first gear launch ratio, achieved by planet gears rotating around a central sun gear. Each sun and planet gearset provides two speeds: a lower underdrive ratio and a 1:1 final lock-up drive ratio.
• Shifting Mechanism: The transmission features a combination flow pneumatic shifter, indicating it utilizes air pressure for gear changes. Lenco transmissions can be configured for CO2 shifting, where an air servo for each gear section shifts the transmission when air pressure is applied. This unit also includes a lockout shifter, providing a secure and precise shifting experience.
• Bell Housing: A titanium Bohr/Boninfante bell housing is included. Bell housings connect the transmission to the engine and are crucial for proper alignment and safety. Titanium bell housings are known for their strength and lightweight properties, making them ideal for high-performance racing applications. The bell housing depth for Lenco transmissions can be around 7.200 inches for aluminum, titanium, or Browell steel options.
• Pressure Monitoring: The inclusion of a pressure port directly to the valve body allows for accurate transmission pressure monitoring. The Lencodrive's main valve body is machined from billet components, not a modified OEM Detroit component, ensuring high performance and durability.
• Construction and Weight: Lencodrive transmissions are known for being short and lightweight. A 2-speed Lencodrive with reverse, bellhousing, and lining weighs approximately 108 lbs. All cases are made of magnesium, contributing to their light weight.
• Compatibility: The Lencodrive will accept virtually any manufacturer's torque converter, with options for Turbo 400, C6, Mega, and standard Powerglide size input shafts .
• Shifting Operation: Shifting a Lenco transmission does not require the driver to disengage the clutch, as all shifting is performed with the engine's clutch fully engaged. When the transmission shifts, a clutch pack compresses the rotating sun gear assembly to the direct drive central sun gear, achieving a 1:1 ratio.

Additional Information Lenco transmissions are widely used in drag racing and other high-speed applications due to their robust design and ability to handle significant power.