Heavy Duty Transmission Parts

When it comes to strength, durability, and performance under pressure, our Heavy-Duty Transmission Parts Collection delivers. Built for high-torque, towing, diesel, racing, and off-road applications, these parts are designed to outperform OEM components and withstand the most demanding conditions.

This lineup includes heavy-duty clutches, steels, bands, valve body components, billet shafts, servos, accumulators, seals, gaskets, and complete rebuild kits—engineered for superior heat resistance, holding power, and hydraulic stability. Each part is precision-machined and performance-tested to ensure consistent operation even under extreme loads.

Whether you’re upgrading a 68RFE, 4L80E, 6L80, 10R80, 5R110W, or 4R70W, you’ll find the best heavy-duty and performance options available. Our collection features top-tier brands like Sonnax, Raybestos GPZ, Alto Red Eagle, and TransGo, trusted by professional transmission builders across the industry.

From Kevlar and carbon bands to billet input shafts and performance clutch kits, every component is built to extend service life, increase torque capacity, and keep your transmission running cool under pressure.

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shift Kits

Valve Body Correction Kits are engineered to restore hydraulic integrity and performance. Whether you're looking to maintain optimal shifting quality or achieve race-level performance, our shift kits have you covered.

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Electrical components

BNB Electrical components are OE replacement parts. Our electrical line includes solenoids, wiring harnesses, sensors, and complete solenoid assemblies. Check out our electrical replacement parts today. 

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heavy duty parts

BNB heavy duty parts are upgraded parts that increase the longevity of your performance build. Whether you are looking to increase towing capacity or torque, check out our HD parts collection. 

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filters

Replacing your transmission filter is critical for prevention of damage

Click below to find the correct filter for your transmission

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Don't forget to replace your pan gasket with transmission service

Looking to have a custom heavy duty rebuild?

Call the Gears specialists for an estimate

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Have questions about parts?

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