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A1 Stage 3 E40D Transmission (A1-S3-TC-E40D-FORD-7.3L) for 1989-1998 Powerstroke 7.3L OBS

Name: A1 Stage 3 E40D Transmission (A1-S3-TC-E40D-FORD-7.3L) for 1989-1998 Powerstroke 7.3L OBS
Brand: A1 Transmissions
SKU: A1-S3-TC-E40D-FORD-7.3L
Availability: InStock

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The A1 6R140 Stage 2 Transmission for 2011+ Ford F-250/F-350 is built to handle 1,000+ horsepower with upgraded billet components for added strength and reliability. Featuring a billet intermediate shaft and hub, welded input hub, cast aluminum pan, and an A1-spec billet cover quad disc torque converter, this transmission is designed for high-performance street, towing, and heavy-duty applications. Backed by a 2-year unlimited mileage warranty against build defects and workmanship.

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SKU: A1-S3-TC-E40D-FORD-7.3L Categories: Cummins: 1989-1993 (5.9L), Drivetrain, Drivetrain, All Products, Powerstroke, Powerstroke: 1994-1997 (7.3L)

Description

Transmission Build Overview

The A1 Stage 3 E40D transmission eliminates factory weak points while supporting extreme power and long-term reliability. Throughout the build, technicians use GPZ clutches and steels and machine the unit to allow for additional clutch capacity. The transmission also features a fully splined FWD drum, billet input shaft, billet intermediate shaft, billet OD planet housing, and a rollerized design to reduce friction and heat.

Internal Upgrades and Reinforcements

To address common failure points, the build includes new roller clutches, upgraded sprags, updated bushings, new molded pistons, and a new OE solenoid pack. In addition, technicians machine and upgrade the center support with a new bearing, a one-piece case bushing, and an OD piston spiral lock for added durability. They properly shim output shaft endplay and install new speed sensors to ensure accurate operation.

Hydraulic Modifications and Cooling

Additionally, custom pump hydraulic modifications and a custom accumulator body improve hydraulic performance. The build converts the torque converter clutch apply system to a non-PWM style, which increases holding power and reliability. To further improve cooling, the transmission includes a cooler bypass delete kit along with a new 4×4 pan and filter where applicable.

Torque Converter and Power Handling

Power transfer relies on an A1-spec billet cover triple disc dampened torque converter with Allison bearings, along with a custom Precision Industries converter. As a result, Gen2 Blue friction materials and Kolene steels provide superior holding power under load.

Applications and Warranty

Ultimately, this transmission supports applications producing 1,000 horsepower or more and is available in both 2WD and 4WD configurations. Each unit includes a 2-year unlimited mileage warranty covering build defects and workmanship.

This transmission is ideal for high-power 7.3L Powerstroke performance builds.

Additional information

Weight	135 lbs
Features	Stage 3 Build Specs Suitable for 1000HP GPZ clutches/steels with maching for extra clutches Fully splined FWD drum New roller clutches and upgraded sprags New OE solenoid pack Updated bushings New molded pistons New gaskets, seals and o-rings Custom pump hydraulic modifications Custom accumulator body All weak problem prone areas addressed and fixed Machined center support OD piston spiral lock One piece case bushing New updated center support bearing New speed sensors Cooler bypass delete kit TCC apply converted to non PWM style New 4×4 pan and filter Output shaft endplay shimmed All cases meticulously inspected, cleaned, bead blasted, and painted All surfaces trued for flatness Billet cover triple disc dampened torque converter with Allison bearings 3 year unlimited mile warranty against build defects and workmanship Billet input shaft Billet FWD drum Billet intermediate shaft Billet OD planet housing Rollerized Custom Precision Industries converter Gen2 Blue frictions and Kolene steels Mag Hytec pan 2 year unlimited warranty against build defects and workmanship
Included	A1 – Billet Cover Triple Disc

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About brand

A1 Transmissions of GA Inc. is a performance transmission shop located in Royston, Georgia. The company specializes in custom transmission builds, repairs, diagnostics, and automatic transmission services for trucks and performance vehicles. A1 Transmission operates from 396 Lee St, Royston, GA 30662 and serves customers who need reliable performance and long-term durability. The A1 team brings more than 55 years of combined experience to every build. They handle all work in-house, including custom builds, full rebuilds, valve body upgrades, torque converters, and advanced diagnostics. Each transmission is built to deliver smooth shifts, strong power transfer, and dependable performance. Their builds support everything from daily-driven trucks to high-horsepower applications. Customer satisfaction drives everything A1 Transmission does. The team treats every vehicle with care and attention to detail. Whether you need a simple repair or a full performance build, A1 Transmission delivers the “A1 treatment” through quality workmanship and proven expertise.

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