The most common transmissions paired with the 5.9 Magnum engine are four‑speed automatics such as the 46RE, 47RE, and in some configurations the 48RE. Manual options exist but are rare. The exact pairing depends on model year and truck trim, so checking the vehicle’s build data is essential.
Automatic transmissions commonly paired with the 5.9 Magnum
Below are the automatic transmissions most typically found behind the 5.9 Magnum in Dodge Ram trucks. Years and configurations vary, so use these as a general guide and verify with the vehicle’s data plate or build sheet.
- 46RE — A four‑speed automatic with electronic control; widely used behind the 5.9 Magnum in Ram 1500 and earlier HD setups from the mid‑ to late‑1990s into the early 2000s.
- 47RE — A stronger four‑speed automatic for heavier‑duty applications; commonly paired with the 5.9 Magnum in HD Ram trucks during the late 1990s and early 2000s.
- 48RE — A later four‑speed transmission with enhanced torque handling; used in select late‑1990s to early‑2000s configurations when the 5.9 Magnum was mated to heavier packages.
Notes on compatibility: exact transmission code and gear ratios vary by year, drivetrain (2WD vs. 4WD), and whether the truck is a light‑duty or heavy‑duty configuration. Always confirm the specific trans code stamped on the unit or consult the factory build data before buying or rebuilding.
Verifying compatibility
To ensure you pair the right transmission with a 5.9 Magnum, check the following:
- Transmission code on the side of the case or the radiator support tag
- VIN/build sheet data for factory transmission specification
- Bellhousing pattern and torque converter compatibility
Because the same engine can appear in multiple trim levels with different transmissions, precise verification helps avoid mismatched parts and transmission control issues.
Manual transmissions occasionally offered with the 5.9 Magnum
Most 5.9 Magnum Rams were equipped with automatics, but there were rare factory or dealer‑installed manual options in certain years. The best‑documented manual pairing is the A833 five‑speed manual, which showed up on a limited number of pre‑1998 Ram 1500s with the 5.9; later years predominantly used automatics, and manual options for the 5.9 became increasingly uncommon.
- A833 5‑speed manual — Rare behind the 5.9 and mostly seen in older or specialized configurations; not a common factory choice in later production runs.
If you are contemplating a manual swap or replacement, verify the fitment, including clutch components, linkage, hydraulic lines, and the transmission mounting system, since these changes can affect drivetrain alignment and overall reliability.
Summary
In practice, the 5.9 Magnum is most commonly paired with four‑speed automatics—especially the 46RE, with the 47RE used for heavier‑duty applications and the 48RE appearing in select later configurations. Manual options are rare, with the A833 being the most frequently cited but uncommon behind the 5.9 in everyday Ram models. Always confirm the exact transmission by checking the build data and the transmission code before any replacement or rebuild project.