The Dana/Spicer Model 30 is an automotive axle manufactured by Dana Corp.

Dana Corp.

The Dana Holding Corporation is a supplier of axles, driveshafts, off-highway transmissions, sealing and thermal-management products, and service parts....

, has a history that dates back to the 1930s and can still be seen in Jeep

Jeep

Jeep is an automobile marque of Chrysler . The first Willys Jeeps were produced in 1941 with the first civilian models in 1945, making it the oldest off-road vehicle and sport utility vehicle brand. It inspired a number of other light utility vehicles, such as the Land Rover which is the second...

 front ends today. The Dana 30 has been manufactured as a beam axle

Beam axle

A beam axle is a suspension system, also called a solid axle, in which one set of wheels is connected laterally by a single beam or shaft...

 and independent suspension

Independent suspension

Independent suspension is a broad term for any automobile suspension system that allows each wheel on the same axle to move vertically independently of each other. This is contrasted with a beam axle, live axle or deDion axle system in which the wheels are linked – movement on one side affects...

 axle setups. There are different variations of the Dana 30.

General specifications

• Ring Gear measures 7.12 inches (18 cm)
• OEM Inner axle shaft spline count: 27
• GAWR
  Gross axle weight rating
  The gross axle weight rating is the maximum distributed weight that may be supported by an axle of a road vehicle. Typically, GAWR is followed by either the letters FR or RR, which indicate front or rear axles respectively.-Importance:...
  
   up to 2770 lbs.

Dana 23

The Dana Spicer 23 is the axle the Dana 30 is loosely based on today, with improvements throughout time. Although this axle was only made for the rear of vehicles. Full floating and semi floating variations were produced.

Dana 25

The Dana Spicer 25 was based on the Dana 23 and was made only as a front axle for Four-wheel drive

Four-wheel drive

Four-wheel drive, 4WD, or 4×4 is a four-wheeled vehicle with a drivetrain that allows all four wheels to receive torque from the engine simultaneously...

 vehicles. This was the company's first front drive axle.

Independent front suspension (IFS) Dana 30 axle

Jeep Liberty

Jeep Liberty

Inspired by styling from the Dakar and Jeepster concept cars, the Liberty was intended as a replacement for the discontinued Jeep Cherokee . Three trim levels were initially offered; the top end Limited, a more rugged looking Renegade and the base Sport. All were made available with either 2WD or 4WD...

 4x4 models use the Dana 30 in the form of Independent suspension

Independent suspension

Independent suspension is a broad term for any automobile suspension system that allows each wheel on the same axle to move vertically independently of each other. This is contrasted with a beam axle, live axle or deDion axle system in which the wheels are linked – movement on one side affects...