When the stock rubber bushings get old they start to break down and allow the front differential to move excessively. This can cause the front half axles and propeller shaft to be at extreme angles while trying to transfer power to the wheels, causing excessive wear and premature failure of these components. This also causes a knock sounding jolt when shifting from P or R to D or vice versa as the differential rotates and slams against the chassis. What compounds these symptoms is the fact that the OEM mounting arm is made of softer metal and is known to break with age or heavy duty use. 

This modern bushing design, when used as a complete set, reduces most excessive movement of the differential and minimizes the problems that come with it. While these bushing mounts reduce differential movement for excellent power transfer from the drive train to the ground, they do not contribute excessive NVH to the driver inside the cabin due to the optimized properties of the compound used. Made of high quality polyurethane material with a steel sleeve and sturdy steel mounting arm, these bushings will firm up the front axle assembly and eliminate that mushy feel associated with the factory rubber bushings. 

Economically, these bushings are an excellent value as they have a long service life compared to OEM ones, and will not need to be replaced as often, saving future labor costs and vehicle down time. 

Each bushing comes pre assembled as pictured and the assembly is ready to press fit into the OEM mounting bracket . Once mounted, no further servicing is required. 

Equivalent to Mopar part number 52114354AA 

https://www.youtube.com/watch?v=-F75GwPmC5g

https://www.youtube.com/watch?v=hgXzUVS58y8