The 48RE transmission is the weakest point on a Dodge Cummins truck. Not only do they fail on trucks with minor upgrades, but even trucks in stock form have been known to be too powerful. A heavy duty truck needs parts which can stand up to heavy trailers, stop-and-go commutes to work, or high-horsepower applications. That's why ATS modifies the transmission to make it the strongest and most reliable part of your drivetrain. With the many shortcomings of the 48RE, none are more important than the clutch packs. This is what takes the power load and transmits it to the rear wheels. We increase the clutch count in the Forward, Overdrive, and Overdrive Brake clutch packs which allow much higher torque capacity in each gear. Clutch material is also essential which is why we use Borg Warner and Raybestos clutches which has both high torque strength as well as longevity and reliability. Another important aspect is the hard parts on the transmission. The factory sheet metal strut anchor is replaced with a much stronger billet strut anchor, allowing more precision application of the band. Along with the factory plastic accumulator piston is replaced with a billet unit as well. The apply lever is a 1:5.0 ratio apply arm, which applies the Borg Warner red lining band. This band features a performance friction material capable of holding higher power levels. The valve body receives extensive modifications as well. We give the valve body the ability to lock the torque converter in 1st and 2nd gear, circulate transmission fluid in park/reverse/neutral, machine the TV valve passage and install our proprietary TV valve sleeve, and increase line pressure. You can choose between a towing or a racing valve body. The towing version will deliver smooth, quick, crisp shifts that enhance the drivability and operation of your transmission on the street and attached to a trailer. This is the valve body of choice for a street driven all-purpose truck. The race valve body is our hardcore power build. It is made to sacrifice as little time as possible between shifts, shift hard and fast, and leave nothing behind. It is a very aggressive valve body and a minimum of billet input shaft and flex plate are recommended. Features: New performance forward clutch pack and steels with 1 added friction New performance direct clutch pack and steels with 1 added friction New performance overdrive brake clutch pack and steels with 1 added friction New performance overdrive clutch pack and steels Low/reverse band replaced with Borg Warner Red Lining performance band Intermediate/2nd gear band replaced with Borg Warner Red Lining performance band 1:5.0 band apply lever Billet Band strut Billet accumulator piston Precision machined forward pressure plate (machined step) Precision machined lower forward pressure plate (machined flat) Precision machined overdrive brake pressure plate (machined flat) New direct pressure plate Performance low/reverse one-way clutch Machined TV valve sleeve (prevents sticking TV valve) Ability to achieve 1st and 2nd gear lockup Ability to circulate fluid to the torque converter in park/reverse/neutral Increase line pressure Improve shift quality and firmness Gaskets, seals, bearing and bushing overhaul kit Stage 1 Transmission The Stage 1 (as well as all ATS Transmission Packages) comes standard with the ATS Deep Pan. Featuring a finned design to dissipate heat, and adding five quarts of fluid vs. stock, the pan helps keep the transmission running cool. ATS Built 48-RE Auto Trans ATS 5 Star Viskus Clutch Drive Torque Converter ATS Extra Deep Transmission Pan Stage 2 Transmission On the Stage 2 build, ATS adds a billet 300m input shaft and forward hub. Featuring a two-piece design, the input shaft is designed to withstand greater than stock power, torque converter lock-up sooner than stock, increased towing weight and racing applications. The increased capacity comes from the material itself, which is stronger than the factory input shaft. This is coupled with a precisely engineered shaft, directed at absorbing torsional loads from increased power, and transferring it into the transmission. ATS Built 48-RE Auto Trans ATS 5 Star Viskus Clutch Drive Torque Converter ATS Extra Deep Transmission Pan ATS Billet Input Shaft Stage 3 Transmission In addition, we include the ATS CoPilot Lock-Up Controller on this package. This controller allows the user to base lock-up on vehicle speed. Torque converter lock-up can be moved to 1st, 2nd, 3rd gear or overdrive – and can be changed at any time. Our controller features in-cab adjustability, so settings can be changed with the push of a button. Every time the vehicle reaches the set speed, the converter locks. The benefit of early lock-up is reduced transmission temperatures, quicker acceleration and better fuel economy. ATS Built 48-RE Auto Trans ATS 5 Star Viskus Clutch Drive Torque Converter ATS Extra Deep Transmission Pan ATS Billet Input Shaft ATS CoPilot Torque Converter Lock-Up Controller Stage 4 Transmission For added strength at power levels above 450 hp, the ATS billet flex plate is included on the Stage 4. The flex plate is first hard part in the transfer of power from the motor to the torque converter/transmission. As more power over stock is added, the OEM flex plate fails to hold and eventually cracks or breaks. This means the loss of all motion in the vehicle. ATS billet flex plate features a stronger material than stock, precisely machined surface for a perfect fit, and the peace of mind needed to handle power and towing weight. ATS Built 48-RE Auto Trans ATS 5 Star Viskus Clutch Drive Torque Converter ATS Extra Deep Transmission Pan ATS Billet Input Shaft ATS CoPilot Torque Converter Lock-Up Controller ATS Billet Flex Plate Stage 5 Transmission Under extreme power or race applications, the stock intermediate shaft becomes a liability. The Stage 5 utilizes a billet intermediate shaft to absorb and transfer extreme power through the transmission. This shaft, arguably, is the most important since an intermediate shaft failure will result in complete transmission failure. ATS Built 48-RE Auto Trans ATS 5 Star Viskus Clutch Drive Torque Converter ATS Extra Deep Transmission Pan ATS Billet Input Shaft ATS CoPilot Torque Converter Lock-Up Controller ATS Billet Flex Plate ATS Billet Intermediate Shaft Stage 6 Transmission Going one step further, we also address the transmission output shaft and transfer case headgear. During boosted launches, or when towing substantial weight, the transmission output shaft and/or transfer case headgear can shear. ATS precisely machines the shafts from billet 300M and matches both pieces to each other. This ensures shock load is absorbed and transferred from the rear of the transmission to the transfer case. ATS Built 48-RE Auto Trans ATS 5 Star Viskus Clutch Drive Torque Converter ATS Extra Deep Transmission Pan ATS Billet Input Shaft ATS CoPilot Torque Converter Lock-Up Controller ATS Billet Flex Plate ATS Billet Intermediate Shaft ATS Billet Output Shaft Build Date Guide: 2003 Transmission: Trucks built from Aug-02 to Dec-03 2004 Transmission: Trucks built from Aug-03 to Dec-03 Note: All ATS Transmission Packages come standard with a 5-Year / 500,000 mile warranty Please include: VIN Number:* Build Date:* Truck Freight Item: Allow 1-2 Weeks for delivery. Truck freight charges apply.