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Some modern automatic transaxles (integrated transmission and differential) do not use a heavy oil at all but lubricate with the lower viscosity hydraulic fluid, which is available at pressure within the automatic transmission. Gear oils account for about 20% of the lubricant market. [1]
The 9.5-inch C-clip rear differential was featured in both the Suburban and pickups, available in 6- or 8-lug variations, employing 33-spline axles. This differential remained in production through 2009 and even found use in vehicles like the TrailBlazer SS, Saab 9-7X, and SSR.
The AMC Eagle's single-speed model 119 New Process central differential used a viscous coupling filled with a liquid silicone-based material. [3] It linked the front and rear differentials for quiet and smooth transfer of power to the axle with the greatest traction, on wet or dry pavement. [4]
The OEM Limited slip differential originally was a "Power Lok" until 1998 when the "Trac Lok" phased it out. Trac Loks were a US$350.00 option with Ford Super Duty trucks. [ 1 ] The Dana 80 Trac Lok is unique being it is a 4 pinion unit, unlike other Dana Trac Lok units with 2 pinions.
They do have the virtue of failing gracefully, reverting to semi-open differential behavior. Typically a visco-differential that has covered 60,000 miles (97,000 km) or more will be functioning largely as an open differential. The silicone oil is factory sealed in a separate chamber from the gear oil surrounding the rest of the differential.
The earliest verified use of a differential was in a clock made by Joseph Williamson in 1720. It employed a differential to add the equation of time to local mean time, as determined by the clock mechanism, to produce solar time, which would have been the same as the reading of a sundial. During the 18th century, sundials were considered to ...
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This is due to the R160 rear differential 3.545 final drive of most of the non-STi WRXs. Pre 2008 model year WRX STi 6MT versions utilizes a self-contained oil system with a trochoidal oil pump mounted in the rear of the transmission case. This capability was removed for 2008 and later years.