Shop 48RE Parts →
The 48RE is the last of the old-school Dodge four-speeds, bolted behind the 5.9L Cummins from 2003 through 2007. It is a stout unit for what it is, but the factory lockup torque converter was never built for the torque a modern tuned Cummins makes. When the converter clutch starts slipping or the single-disc lockup burns up, you feel it as a shudder, a flare on lockup, or dropped fuel economy long before you throw a code.
Replacing the converter is one of the more common 48RE repairs, and it is also the single best time to upgrade. Because the converter has to come out with the transmission (or at least the trans pulled back off the dowels), you are already paying most of the labor. Putting a $150 remanufactured stock converter back in a truck that is going to tow is throwing money away.
48RE Torque Converter Replacement Cost — The Numbers
Two things drive the total: which converter you choose, and whether the transmission has to come all the way out. On the 48RE the converter cannot be removed with the trans in place, so budget for R&R either way.
| Job Scope | Parts | Labor | Total |
|---|---|---|---|
| Stock reman converter, shop install | $150-$300 | $450-$700 | $600-$1,000 |
| HD single-disc converter, shop install | $350-$550 | $450-$700 | $800-$1,250 |
| Billet triple-disc converter, shop install | $700-$1,100 | $450-$700 | $1,150-$1,800 |
| DIY (you pull the trans) | Parts only | $0 + a weekend | Cost of converter + fluid |
Labor runs 5 to 8 hours at $110-$160/hr depending on 2WD vs 4WD and how rusty the truck is. Northern trucks with seized crossmember bolts push toward the high end. Always replace the front pump seal and the front bushing while the converter is out — a fresh converter will chew up a worn bushing fast.
Symptoms of a Failing 48RE Converter
The 48RE converter almost always fails at the lockup clutch first, not the fluid coupling. Watch for:
- Lockup shudder: a rhythmic vibration between roughly 45 and 60 mph as the converter clutch engages, like driving over rumble strips. Worst under light throttle on a slight grade.
- Slipping on lockup: RPM flares 200-400 when the converter should lock, then settles. You may see the tach hunt up and down at cruise.
- Dropping fuel economy: a converter that will not hold lockup runs the engine faster than it should. A 1-2 mpg drop on a Cummins is a real clue.
- Elevated transmission temps: a slipping lockup dumps heat into the fluid. If your gauge climbs 20-30 degrees over normal at highway cruise, suspect the converter.
- P0740 or P1740: torque converter clutch circuit or TCC solenoid codes. Often the governor pressure sensor/solenoid is involved on these trucks, so diagnose before you condemn the converter.
A stall test and a scan-tool look at TCC slip RPM will confirm it before you spend a dime on parts. Shudder that only happens cold and clears when warm is more often fluid or valve body than a dead converter.
Stock vs HD vs Billet — Which Converter
Stock Reman (Stock-Stall, Single Disc)
Fine for a bone-stock, un-tuned truck that never tows heavy. Rebuilt on the factory core with new clutch lining. Cheapest option and it will get you back on the road, but it is the same design that failed the first time. If your truck is tuned at all, skip it.
Heavy-Duty Single or Dual Disc
Upgraded friction material and a beefier clutch, sometimes furnace-brazed fins to keep the converter from ballooning under boost. This is the sweet-spot choice for a lightly tuned daily-driver Cummins that tows a trailer a few times a month. Holds lockup where the stock unit gives up.
Billet Cover Triple-Disc
A billet steel front cover instead of stamped steel, plus three lockup clutches to spread the load. This is what you buy if the truck is tuned hard, sled-pulls, or tows near the axle rating every day. The billet cover resists ballooning at high line pressure, and the triple-disc clutch holds several hundred extra lb-ft without slipping. Also the time to choose your stall speed if you want the turbo to spool quicker off the line.
Browse 48RE billet torque converters
Don't Reuse These Parts
A converter swap is only as good as the parts around it. While the trans is out, replace:
- Front pump seal and bushing — a worn bushing lets the new converter walk and leak.
- Filter and fluid — ATF+4 only, and the correct volume. Burnt fluid recontaminates a fresh converter.
- Flexplate bolts — inspect the flexplate for cracks around the converter pads; these crack on high-torque Cummins trucks.
- Governor pressure solenoid and sensor — if you had shift or lockup complaints, do these now while the pan is off. They are a known 48RE weak point.
48RE Parts, Ships Same-Day
Doing the converter yourself? Our companion shop gearboxinsider.com stocks 48RE filters, ATF+4, governor pressure solenoids and sensors, front pump seals, and full overhaul kits. Same-day ship before 2pm Eastern.
Shop Gearbox Insider →FAQ
Can I replace the 48RE converter without dropping the transmission?
No. The converter sits inside the bell housing on the input shaft and pump. The trans has to come back off the dowels at minimum, and most shops pull it fully to reach the converter and reseal the pump.
Will a billet converter fix my shudder?
If the shudder is the lockup clutch slipping, yes. If the shudder is coming from the valve body, governor pressure solenoid, or old fluid, a new converter alone will not cure it. Diagnose first.
How long does a 48RE converter last?
A stock converter on a stock truck can go 150,000 miles. Add a tuner and a trailer and the factory single-disc can burn the lockup in as little as 40,000-60,000 miles. A billet triple-disc is effectively a lifetime part for most owners.
Do I need to re-learn or reset anything after the swap?
The 48RE is largely hydraulic with electronic governor pressure control, so there is no long adaptive relearn like a modern 8-speed. Set line pressure and TCC apply correctly, verify no codes, and road-test for clean lockup.