Tier One's Stage 1 48RE Transmission Features:
- Built 48RE transmission that can handle bolt-on parts, towing, and off-roading
- Handles up to 380 horsepower from basic parts and extremely mild Cummins tunes
- Complete, drop-in transmission for 2003 Ram 5.9L Cummins trucks
- Includes a billet single-disc torque converter, billet accumulator, billet band strut & anchor, billet 4.2 band lever, high-pressure valve body, performance rebuild kit, OEM 2nd gear servo, heavy-duty governor and transducer, and a deep transmission pan
- Fixes common 48RE transmission issues while allowing you to bump up your truck's power
- A great choice for adding some power to your daily driver or towing rig
- Black finish for a great look under your truck
- Valve bodies are both leak-checked and dyno-tested before installation
- All transmissions are thoroughly tested on our in-house transmission dyno
- Comes backed by a 2-year, unlimited mileage warranty
- Requires additional core charge and freight shipping
- If you have questions or want a custom 48RE build, contact Tier One or call 602-399-5484!
Built 48RE Transmission for 5.9L Cummins Rams in need of an uprated replacement for stock transmissions
The factory 48RE transmission on your 2003 Ram 5.9L Cummins was never known for its ability to handle extra power or tough towing applications when it was new, much less after all these years on the road. Tier One's Stage 1 48RE Transmission was designed specifically to serve as a baseline replacement for the 48RE, but comes with just enough upgrades to fix some of the common problems on the 48RE transmissions and hold some extra power. The Stage 1 48RE transmission is the perfect choice for stock or near-stock Ram 2500 or 3500 trucks in need of a new transmission, or Ram Cummins builds running basic bolts like cold air intakes and turbo-back kits with extremely mild tuning. Tier One's Stage 1 48RE offers improved reliability and durability over the stock 48RE transmissions so that you can tow, drive around town, and hit those off-road trails with bigger tires without your awesome 5.9L Cummins Ram letting you down. This complete 48RE transmission drops right into place of the factory transmission without the need for any permanent modifications or custom tuning.
Includes new Billet Internal Components and a Complete Overhaul Kit to Solve Issues and Ensure Reliability
The Tier One Stage 1 48RE Transmission for 2003 Ram 5.9L Cummins trucks includes high-quality parts that help improve the overall reliability and durability of your truck's drivetrain. Starting at the outside of the transmission, Tier One includes a billet single-disc torque converter whose case is less prone to cracking and burn-up than the stock torque converter. The Stage 1 transmission also comes with deep transmission pan that increases fluid capacity to improve cooling when towing or under sustained load. Internally, the Stage 1 comes with a billet aluminum accumulator that replaces the failure-prone OEM plastic accumulator to maintain smooth shifting under load. Each Stage 1 48RE transmission comes standard with a both a billet band strut and billet band anchor to help prevent the 2nd gear band from warping and flexing when placed under load. To further assist the 2nd gear band, we include a 4.2 billet band lever that produces more leverage on the 2nd gear band than the stock 3.8 lever, while also being stronger to help prevent failures. The Stage 1 48RE transmission is also fitted with a heavy-duty governor solenoid and and HD transducer kit to replace the weak stock plastic components for improved reliability. Each Stage 1 48RE is built around a high-pressure valve body that optimizes fluid flow and can handle higher line pressures than stock. Each transmission receives a performance rebuild kit that includes 6 overdrive clutches and 6 direct clutches. The Stage 1 48RE is finished off with new gaskets and seals before being air-checked for potential leaks.
Fully Overhauled 48RE Transmission for Excellent Reliability
During our build of your 48RE Stage 1 transmission, we here at Tier One go over every millimeter of its internal components to guarantee excellent function and reliability. All parts are disassembled and cleaned from our OEM cores to ensure your new 48RE transmission is free from contaminants and other debris. We carefully inspect your transmission’s planetary gear train for damage before fully speccing all bearings and washers for endplay. The original transmission pump gets a cut stator, and is then checked for proper clearances. The valve body is likewise flat-sanded and its solenoids thoroughly inspected for better than OEM function. The performance rebuild kit includes new Borg Warner clutches, seals, gaskets, and sealing rings to replace all the wearable parts of the transmission before it’s installed on your Ram 2500 or Ram 3500.
Thorough Testing of the Valve Body and Entire Transmission Before Shipping
We here at Tier One take pride in every built 48RE transmission we manufacture for the Ram 5.9L Cummins trucks. To make sure that you get a transmission that’s as tough as your truck, Tier One puts both the valve bodies and the entire assembled transmission through rigorous testing to ensure you get the reliability you need for heavy towing and hauling applications with your 5.9L Cummins diesel. Once the valve body has been assembled, it’s air-checked for leaks before being put on our in-house valve body dyno to ensure proper fluid flow and pressure management. After final assembly of the transmission itself, we put it through a complete air-check to find potential leaks before putting the entire transmission on our in-house transmission dyno to ensure proper operation, performance, and power-holding.
Specifications:
- Vehicle Fitment: 2003 Ram 5.9L Cummins 2500 & 3500
- Transmission Type: Chrysler 48RE
- Power Rating: Up to 380 horsepower
- Torque Converter: Billet single-disc
- Flex Plate: OEM
- Input Shaft: OEM
- Transmission Pan: Deep pan with increased capacity
- Valve Body: High-Pressure
- Intermediate Shaft: OEM
- Clutches: Borg Warner Performance Rebuild Kit
- Output Shaft: OEM
- Geartrain: OEM
- 2nd Gear Band: OEM
- 2nd Gear Servo: OEM
- Band Strut: Billet Steel 2nd gear Band Strut
- Band Anchor: Billet Steel 2nd gear Band Anchor
- Band Lever: 4.2 Billet Steel Band Lever
- Accumulator: Billet Aluminum
For 2003 Ram 5.9L Cummins only: this transmission will only fit 2003 Ram 5.9L Cummins 2500 & 3500 trucks. A
2004 Ram 5.9L Cummins Stage 1 48RE Transmission and
2005-2007 Ram 5.9L Cummins Stage 1 48RE Transmission are also available. Please see our selection of
Ram 47RE & 48RE transmissions if you have an older Ram.
2-Year, Unlimited Mile Warranty: each Tier One built transmission comes backed by a 2-year, unlimited mile warranty. Please see our
Warranty Terms and Conditions here.
Recommended gearing: the following gearing is recommended for the following tire sizes, and is required for Tier One to honor your warranty:
- 35" Tire: 3.73 gears or higher
- 37" Tire: 4.10 gears or higher
- +38" Tire: 4.56 gears or higher
Core charge: this transmission includes a $2000.00 core charge that will be refunded upon receipt of your stock transmission. For more information and/or instructions for sending in a core, call 602-399-5484.
Freight Shipping: this transmission ships via freight. Please carefully inspect your transmission before signing your Bill of Lading. If your transmission arrives damaged, please call us directly at 602-399-5484.
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