A 48RE behind a stock 5.9 Cummins, serviced regularly and towing within the truck’s rating, commonly lasts 150,000 miles or more. Its life drops quickly with added power, heavy towing and overheating, which is why built 48RE units are popular with Cummins owners. The 48RE replaced the 47RE for the 2003 model year and is the four-speed automatic behind the common-rail 5.9 Cummins through 2007.
How to make a 48RE last
- Keep the throttle valve cable adjusted to specification; a misadjusted cable burns clutches quickly.
- Service the fluid and filter regularly with ATF+4, and more often if you tow.
- Keep the bands adjusted as the service manual specifies.
- Add an auxiliary cooler and watch temperatures when towing; see transmission coolers.
- Match the transmission to the engine’s power; stock units are not built for big power gains.
Known weak points
Overheating, worn overdrive clutches, governor pressure faults and slipping under load; see 48RE problems.
Signs it is wearing out
- Slipping or flaring between gears; see transmission slipping.
- Delayed engagement into drive or reverse.
- Harsh shifts that adaptive relearn or service does not cure.
- Dark, burnt fluid or heavy debris in the pan; see what the metal on the pan magnet means.
Overdrive and lockup under load
The overdrive section and the converter clutch work hardest at highway speed with a trailer, so that is where wear usually shows first. If overdrive slips, flares or the transmission temperature climbs when towing, lock out overdrive on grades and have the transmission checked before the clutches are damaged. Watching a transmission temperature gauge is cheap insurance on a towing truck, and the pan should be dropped periodically to inspect for debris and check the filter.
Will a 48RE replace a 47RE?
The two are closely related, and a 48RE is sometimes fitted in place of a 47RE, but there are differences in electronics, input shaft and converter depending on the years involved. Match the replacement to your truck, or confirm the changes needed before fitting a different version; see 47RE vs 48RE.
Stock vs built
For stock trucks, a direct replacement is enough. For heavy towing or added power, a built unit with stronger clutches, a heavy-duty converter and improved valve body is the usual choice; see 48RE vs 68RFE for how it compares with its successor.
Replacement units we list
- StreetMonster Dodge 48RE: $4,099.00
- SportMonster Dodge 48RE: $5,594.95
Each includes a torque converter. See 48RE transmissions and how long a Cummins lasts.
More guides: how long a rebuilt transmission lasts · how long a 47RE lasts.
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