GM / Chevy 6L90 Rear Planet Assembly (2007–2024)
The GM/Chevy 6L90 rear planet assembly is a critical internal transmission component designed for vehicles equipped with the 6L90 6-speed automatic transmission from 2007 through 2024. This rear planetary gear set manages torque distribution to the output shaft, ensuring smooth gear engagement and proper power transfer under load. Because the 6L90 relies on precise planetary alignment, a properly functioning rear planet assembly is essential for reliable shifting, durability, and long-term transmission performance.
Over time, worn planetary gears, damaged pinions, or failing bushings can cause slipping, noise, harsh engagement, or premature internal wear. Replacing the 6L90 rear planet assembly restores torque flow and improves gear operation. Installing a new rear planet also helps protect clutches, bearings, and other transmission components, ensuring smooth and consistent shifts. Always confirm that your vehicle uses the 6L90 transmission, since other GM 6-speed transmissions like the 6L80 or 6L65 use different planetary designs.
This rear planet assembly works best when installed during a complete rebuild or major transmission service. Pairing it with new bearings, thrust washers, clutches, and seals ensures long-term reliability and optimal performance. Customers can also browse related parts on our site, including 6L90 rebuild kits, valve bodies, and hard parts, to complete a full transmission overhaul.
Vehicle Compatibility
GM / Chevrolet Applications
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Chevrolet Silverado 2500/3500 HD (Duramax Diesel, 6.6L): 2011–2024
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Chevrolet Tahoe / Suburban: 2007–2024
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GMC Sierra 2500/3500 HD (Duramax Diesel, 6.6L): 2011–2024
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Cadillac Escalade: 2007–2024
Fitment Notes
This rear planet assembly fits 6L90 transmissions only. Always verify the transmission code, engine type, and model year before purchase. Proper verification ensures correct torque distribution, smooth gear engagement, and extended transmission life.
Also, consult official GM service manuals for installation procedures and torque specifications.
Below is a link to a digram of the 6L90 Transmission!
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