A Transfer Case is a fundamental part of the 4-wheel drive system on your 1998.5-2002 Dodge Ram 2500/3500. The Transfer Case mounts to the back of the transmission and is what the front and rear drive shafts connect to. 4-wheel high will maintain the same gear ratio as 2-wheel drive and is for high-speed situations such as driving on dirt or snow-covered roads. 4-wheel high is used in high-speed settings such as dirt or snow, whereas 4-wheel low is used in low-speed settings like steep rocky hills where maximum wheel torque is required. It is responsible for transferring power to the front wheels and rear wheels in 4-wheel drive systems. Contained inside the transfer case is a set of gears and chains that are engaged or disengaged depending on the drive mode selected.
It is highly recommended to not engage the transfer case for anything other than off-road or low-traction situations. Since transfer cases lock the front and rear axle together, the wheels are unable to spin at different speeds making turning and cornering on dry pavement difficult. Wheel slip is possible in loose terrain, alleviating any binding that can occur on dry pavement. XDP carries a wide selection of Transfer Case products available from Dorman, Merchant Automotive, PPE, Sun Coast Converters, and more. A Transfer Case typically does not require internal upgrades or modification unless the vehicle will be used for extreme off-roading or racing applications. External upgrades such as transfer case braces are offered for certain applications that add structural rigidity to prevent damage from high torque loads and twisting.