What is a two-speed diff?
The dual-ratio differential is exactly what its name suggests: the rear differential provides two different gear ratios: a shorter one for maximum tractive force for faster acceleration or steep grade-climbing capability, and a taller one for quiet, fast highway cruising (the Columbia two-speed axle was said to be able …
What is a Columbia 2 speed rear end?
The Columbia two-speed offered a low gear ratio for low-speed pulling power and fast acceleration from a dead stop. It could then be shifted into a higher ratio on the fly to give the vehicle a smoother and more efficient ride for highway speeds.
What is a Columbia overdrive?
The Columbia overdrive rear end was an early design overdrive that was adapted to the stock Ford rear end housing, and was designed to provide a dual ratio for the rear end. …
Do you need a 2 speed rear end in a truck?
In modern trucks, a 2-speed rear end isn’t really necessary, which is why they are far less common now. Back in the day trucks didn’t have that much horsepower and torque. Today in 2017 you can buy a 3/4 ton truck with 910 lb-ft of torque right off the showroom floor.
Where did the two speed rear axle come from?
One of several overdrives to appear in the late 1920s, it had great success after Ford began offering it as a factory option. Originally developed by the Columbia Axle Company in Cleveland, Ohio, the two-speed axle was first used as an option on the 1932 Auburn.
What are the benefits of a 2 speed differential?
Benefits of a 2-Speed Axle If you need to haul a heavy load you’ll want a really low gear rear end. This will multiply the torque, effectively making the wheel torque much greater, allowing you to tow heavier loads. However, a low gear limits your cruising speed, as it makes your engine RPM high.
What kind of differential do I need for 3 / 4 ton truck?
Today in 2017 you can buy a 3/4 ton truck with 910 lb-ft of torque right off the showroom floor. With 910 lb-ft you don’t need nearly as much torque multiplication, allowing for a lower differential gear ratio. In a standard differential, the wheels are the ring gear rotate at the exact same speed.
