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The Dana/Spicer Model 30 is an automotive axle manufactured by Dana Holding Corporation. It has been manufactured as a beam axle and independent suspension axle with several versions. 2011 Jeep Dana 30 differential Jeep Dana 30
The 10.5" 14-bolt differential and axle is quite popular with Jeep Wrangler owners who want to upgrade their standard Dana 30, Dana 35, or Dana 44 axle. While the 10.5" 14-bolt axle is heavier than the standard Dana axles offered on the Wrangler, it is much stronger.
The normal (3") input Dana 18s are interchangeable, but the input gear must match the transfer case. The "big hole" (4" input) Dana 18 is transmission-interchangeable with the Dana 20. Almost all Dana 18 and Dana 20 input gears are 6-spline; the only exception is the one used with the 10-spline version of the T14 transmission.
The Dana 70 rear axle was first used in the Dodge W300 in 1958. The Dana 70 started out using 10 spline pinions and 23 spline axle shafts. The later, more current, Dana 70 axles use 29 spline pinions and 32 or 35 spline axle shafts. Dana offered two different limited slip differentials with the Dana 70, the "Powr-Lok" and the "Trac-Lok."
In the 1960s, Jeep used a unique Dana 44 IFS setup, that was short lived. In the 1980s and 1990s, Ford used a form of IFS known as "Twin Traction Beam" (TTB). This Dana 44 had no axle tubes but attached to the driver side traction beam, which also acted as a cover plate, and had "open air" axles which traveled through the beams to the spindles.
1996–1999: Dana 30, high pinion, reverse cut, 297x/760 universal joint, 27-spline axle shafts 2000–2001: Dana 30, low pinion, standard cut, 297x/760 universal joint, 27-spline axle shafts 1985–2001: straight non-driven front axle for two-wheel drive only
A unique quality of the Dana 50 axle is the lack of variation in both TTB and Solid axle versions, which simplifies repairs and upgrades. There were no carrier breaks and only one spline count (30 spline). Gross axle weight ratings were lowered by Ford for safety and tire reasons. Dana 50 TTB from a 1996 F-250
A common use of differentials is in motor vehicles, to allow the wheels at each end of a drive axle to rotate at different speeds while cornering. Other uses include clocks and analogue computers. Differentials can also provide a gear ratio between the input and output shafts (called the "axle ratio" or "diff ratio").