47RE Pump 1994-03

Second-generation Ram 2500 and 3500 owners usually find this pump after the truck starts sitting a beat too long in Neutral before Drive or Reverse grabs, the temperature gauge climbs on every grade, or a whine shows up that rises with the tach instead of the speedometer. This is a complete remanufactured front pump for the A618 (47RH/47RE) from 1993 to 2003, and it also covers the A518 (46RH/46RE) from 1994 to 2003. The pump body surface and gear pocket have been machined back to specification, the stator support face has been cut, and it is built with the 1.250 inch ID stator rear bushing.

What the pump does in a 47RE

The front pump is the only thing in a 47RE that makes oil flow. The converter hub drives its gears at engine speed, and the pressure regulator uses that output to build line pressure before it sends the rest to converter charge, the cooler and the gear-train lube. When the gears and pocket wear, oil slips from the pressure side back to suction, and the circuits at the end of that line go short first. That is why a tired 47RE pump tends to show up as a hot-running, slow-to-engage truck before it ever slips a clutch. The stator support on this assembly also centers the turbine shaft, and its two sealing rings separate converter apply and release oil, so the support face and bushing matter as much as the gears.

Symptoms of a worn 47RE front pump

• Delayed engagement into Drive and Reverse, worst hot at idle
• Whine that follows engine RPM in Park and Neutral
• Fluid temperature higher than normal when towing or climbing
• Converter clutch that will not stay applied, sometimes with 740/1740 codes
• Bright aluminum or fine steel in the pan with the friction dust
• Front seal leak plus a new noise from a worn pump bushing

How to confirm before you buy

Start with the fluid: level checked hot in Neutral with ATF+4, then pull the pan and look at the filter. A gauge on the line pressure port should reach maximum at fast idle; low at idle that recovers with RPM points at pump wear, while a bouncing needle with a whine usually means air from a cracked or unseated filter. The factory manual also gives a pump volume check at the cooler line: about one quart in 20 seconds at idle. Low flow that stays low with the cooler bypassed is the pump or converter. The full sequence is in our 47RE pump failure symptoms guide, and 47RE common problems and fixes covers the overdrive clutch and band faults that get mistaken for pump trouble.

Fitment

Listed for the A618/47RH/47RE from 1993 to 2003 and the A518/46RH/46RE from 1994 to 2003, which includes the 5.9L Cummins and 8.0L V10 Ram 2500/3500. It uses the 1.250 inch stator rear bushing and the rebuilder states it will not fit earlier units built with the 1.170 inch ID stator bushing. It is described as a non-lock-up style pump with two check balls. Pull your old pump or check your rebuild records and match the stator bushing size and check ball count before you install it, or send us your year and VIN and we will confirm it. The rest of our 47RE parts are on the 47RE transmission parts page.

Install notes

• The transmission has to come out; the pump is removed from the front of the case behind the converter.
• The pump ships with a new body bushing, front seal, pump-to-case gasket, front pump O-ring and two stator support sealing rings.
• Align the two halves before torquing the screws to the factory specification. An unaligned pump can bind or leak once the converter goes in.
• Check the converter hub and crankshaft pilot. A worn pilot lets the turbine shaft rings cross-leak, which looks like a weak pump on the gauge.
• Seal the overdrive support to the case on reassembly. Sonnax notes many OE supports leak lube there, which consumes pump volume.
• Clean or replace the cooler and lines, then refill with ATF+4 and set the level hot.

If the pan shows burned frictions, the same debris went through the clutch packs, and the 47RE master rebuild kit belongs in the same teardown. Trucks with an erratic shift schedule should also get the 47RE solenoid kit checked while it is apart.

Will this pump fit my 1993 Ram 2500 with a 47RH?

Only if your unit has the 1.250 inch ID stator rear bushing. The listing covers 1993-2003 A618/47RH/47RE and 1994-2003 A518/46RE, and the rebuilder states it will not fit earlier units with the 1.170 inch ID stator bushing. Measure your old pump or send us your VIN.

What comes with this remanufactured pump?

The complete pump with a machined body and gear pocket and a face-cut stator support, plus a new pump body bushing, front seal, pump-to-case gasket, front pump O-ring and two stator support sealing rings.

What does non-lock-up style with two check balls mean for my truck?

That is how the rebuilder describes this pump's internal layout. Compare the check ball count and stator bushing on your old pump with this one before installing, or send us your year and VIN so we can confirm it matches.

How do I test pump output on the truck?

Gauge line pressure at fast idle and look for it to reach maximum. Then check flow at the cooler return line; the factory manual calls for about one quart in 20 seconds at idle. Repeat with the cooler bypassed to separate a plugged cooler from a weak pump.

Do the pump halves need to be aligned?

Yes. Align the two halves before torquing the screws to the factory specification. Skipping it is a common cause of a new pump binding or leaking.

• 47RE Pump Failure Symptoms and Replacement
• 47RE Common Problems and Fixes
• 47RE Ram 3500 Cummins Common Problems and Fixes
• Dodge 46RE, 47RE, and 48RE Transmissions: What Breaks, What to Check, and How to Fix Them