A Transfer Case is a fundamental part of the 4-wheel drive system on your 2004.5-2007 Dodge Ram 2500/3500. There are usually two different gear ratio options with a Transfer Case, 4-wheel low and 4-wheel high. Transfers cases typically have two 4-wheel drive settings, a high and low gear ratio for different situations. 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. Bolted to the back of the transmission, a transfer case has two driveshafts connected to it that run to each axle. The transfer case in a 4-wheel drive system is responsible for transferring power to both the front and rear axles.
The Transfer Case is designed to be used in off-road or low-traction situations and is not recommended to be used on dry pavement where wheel slip is not possible. In some applications an external brace can be added to increase the structural rigidity of the transfer case to prevent damage from high torque loads or twisting. 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. When engaged in 4-wheel drive the transfer case and drivetrain need some wheel slip to prevent binding or damage. When you shift the Transfer Case into 4-wheel drive, it locks the front and rear axles together so that they spin at the same speed.