* Towing or hauling heavy loads: Disabling overdrive keeps the engine in a lower gear, providing more power for climbing hills or maintaining speed on inclines.
* Engine braking on downhill grades: Lower gears provide more engine braking, helping to control speed and reduce brake wear.
* Increased engine braking in slippery conditions: Similar to downhill driving, lower gears can help improve traction and stability on ice or snow.
* Manual shifting through gears: Some drivers find it easier to manually downshift to lower gears for greater control while towing or in challenging conditions if the transmission allows.
Essentially, it's a way to manually control the transmission's highest gear ratio for better performance in specific situations. When the OD OFF light is illuminated, overdrive is disabled.
