Description
Eaton 6109 Transmission – 9-Speed Synchromesh (Medium-Duty)
The Eaton 6109 is a 9-speed synchromesh manual transmission used in a range of medium-duty truck applications. It’s designed for reliable on-road performance with a practical gear spread for linehaul, vocational, and general transport use. Eaton’s 9-speed synchronized medium-duty platform is rated up to 1475 lb-ft max torque and 120K lbs max GCW (spec varies by exact model/version).
Key Features
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9 forward speeds (all synchronised) + 1 reverse for smooth shifting and driver comfort
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PTO provision: left side two standard SAE openings (6-bolt short length) on the Fuller Synchromesh specification set
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Built for medium-duty service where durability and serviceability matter





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