46RE / 47RE / 48RE
Valve Body Buyer's Guide

The 46RE, 47RE and 48RE are all descendants of the A518 TorqueFlite four-speed. They use hydraulic shift logic, a throttle valve (TV) cable, two bands, and an electronic governor pressure circuit that replaced the old mechanical governor in 1996. The valve body is where all of that meets, and it is the part that decides how hard the truck shifts, when it shifts, and whether it keeps doing it after 150,000 miles of towing.

The problem is that "46RE valve body" covers several different parts. The casting stayed close over the years, but the hardware bolted to it, the calibration, and the connectors changed. Buying the wrong year gets you a valve body that bolts in and then shifts wrong, or does not plug in at all.

Year Splits That Matter

The fastest way to avoid a mismatch: pull the pan, photograph the valve body from above and from the connector side, and check the transmission tag on the case for the part number. Match the governor solenoid and transducer connectors and the park/neutral switch style to the listing.

To confirm a 48RE body on the bench, check the separator plate. TransGo notes that only 48RE plates have a balance hole in a specific area, and warns that hybrid valve bodies are common, so always check the plate before you trust the casting [4]. Sonnax explains why this matters: a 46/47RE valve body on a 48RE seems fine at first, then the truck comes back with a failed converter clutch or overdrive clutch because the lower lockup and 4th-gear line pressure cannot clamp them [1]. If 48RE cores are scarce, TransGo's SK 48RE-CV converts a 46RE or 47RE core that has a boost tube, a 4-land switch valve and a 3/16 in. checkball, reusing the truck's 48RE rooster comb [3]. For the full breakdown, see our 46RE vs 48RE comparison.

Browse by model: 46RE parts · 47RE parts · 48RE parts

Remanufactured vs Updated vs Your Old One Rebuilt

Stock remanufactured

Cleaned, inspected, worn parts replaced, built back to factory calibration. Right for a daily driver or light-duty truck that failed from age. Example: 46RE remanufactured complete valve body (1995-2003) and 47RE remanufactured complete valve body (1995-2003).

Updated and dyno-tested

Built with aftermarket bore repairs and corrected valves where the factory design wears, then run on a test stand before it ships. This is the one to buy for a towing truck, a Cummins with added power, or any truck that has already burned up a rebuild. Examples: 47RE 1996-1999 updated, dyno-tested, 46RE 2000-2001 updated, and 46RE 2002-up push-in neutral switch.

Rebuilding your own

Doable if you have a clean bench, a way to check bore wear, and patience with a lot of small springs and check balls. The failure point is usually not the rebuild itself but missing a worn bore that keeps leaking pressure. If the truck has overheated fluid or more than one prior rebuild, an updated unit is cheaper than doing the job twice.

What Actually Fails on an RE Valve Body

• Governor pressure solenoid and transducer. The number one cause of 2nd-gear starts, erratic 1-2 shifts, and no upshift. They mount on the valve body, so replace them with it. The 48RE solenoid and filter service kit covers the solenoid, transducer, filters and pan gasket in one box.
• Manual valve detent wear. The detent spring and roller wear, and the selector stops landing cleanly in each range. You get a vague shifter or a gear that drops out on bumps. A detent repair kit fixes it without replacing the whole valve body.
• Worn bores and sticking valves. Aluminum bores wear oval over time, especially where valves stroke every shift. Pressure leaks past, shifts get soft, and the clutches slip and burn.
• Overdrive / TCC solenoid assembly. Causes no overdrive or no lockup. Test it before blaming the valve body.
• Debris from a failure elsewhere. A valve body pulled out of a trans that shed clutch material is rarely worth cleaning. The debris packs into every bore.

For Cummins trucks that keep eating governor solenoids, the 47RE/48RE solenoid block conversion kit swaps the factory governor pressure solenoid for a GM-style pressure control solenoid in a machined manifold.

Before You Bolt It In

• Hold the accumulator in place. The accumulator piston and springs under the valve body are retained by it. Note their orientation when the old one comes out.
• Guide the park rod. The park rod has to seat correctly as the valve body goes up. If Park does not lock the output shaft afterward, it is not seated.
• Torque the bolts evenly and lightly. These are small bolts into aluminum. Over-torque warps the plate and creates cross leaks.
• Adjust both bands. Set the front (kickdown) and rear (low/reverse) bands to the factory spec for your transmission while the pan is off. The 1998 Chrysler manual has you tighten each screw to 72 in-lb and back off: 46RE front 2-7/8 turns and rear 2 turns, 47RE front 1-7/8 and rear 3 turns [5].
• Set the TV cable. Do it before the first drive. A loose TV cable is the quickest way to burn a new build. On a 2005-up diesel 48RE there is no cable; the electric TTVA does the job [2].
• New filter and pan gasket. Fill with ATF+4, check level hot in Neutral with the engine running.

FAQ

Will a 46RE valve body work in a 47RE?

Sometimes, but do not assume it. The castings are closely related, yet 47RE and 48RE units behind the Cummins run different line pressure and shift calibration than a gas-engine 46RE. Buy the valve body listed for your transmission and year, and compare the old and new side by side before installing.

Do I need to adjust the TV cable after a valve body swap?

Yes. The throttle valve cable sets line pressure and shift timing on every cable-equipped RE unit. If it is too loose the clutches and bands slip and burn under load. Adjust it to the factory procedure before the first drive, not after. The exception is a 2005-up diesel 48RE, which uses an electric throttle valve actuator instead of a cable.

Does a new valve body fix 2nd-gear starts?

Usually not by itself. A 2nd-gear start on an RE is most often the governor pressure solenoid, the governor pressure transducer, or wiring to them. Those parts ride on the valve body, so replace them at the same time if they are original.

What fluid does the RE family use?

ATF+4. Do not use a generic multi-vehicle fluid in an RE that has fresh friction material and a new valve body.