The 47RE and 48RE were the workhorses behind Cummins diesels from 1994-2007. Found in Ram 2500/3500. Now they're aging and many are getting rebuilt. Here's what you need to know.
47RE basics
- 4-speed automatic with overdrive
- Years: 1994-2002 production
- Applications: Dodge Ram 2500/3500 with 5.9L Cummins
- Torque capacity: ~430 ft-lb stock
- Predecessor to: 48RE
- Successor: Was the workhorse before 48RE
48RE basics
- 4-speed automatic with overdrive
- Years: 2003-2007 production
- Applications: Dodge Ram 2500/3500 with 5.9L Cummins
- Torque capacity: ~570 ft-lb stock
- Strengthened version of 47RE
- Common upgrade: From 47RE for 5.9L Cummins owners
47RE vs 48RE: what's different
48RE improvements over 47RE
- Strengthened input shaft
- HD intermediate band
- Improved direct clutch
- HD output shaft
- Updated valve body calibration
- Higher torque capacity (430 → 570 ft-lb)
Internal parts that interchange
Most. But verify year-specific applications. Some specific HD parts only available for 48RE.
What doesn't interchange
- Year-specific solenoid packs
- Specific TCM strategy
- Some valve body components
Common 47RE failures
1. Direct clutch wear
The #1 failure point. Direct clutch sees the brunt of HD diesel torque.
Fix: HD direct clutch during rebuild.
2. Intermediate band failure
Stock 47RE intermediate band fails under HD use.
Fix: HD band (Sonnax, ATI) during rebuild.
3. PR (pressure regulator) valve wear
Same family as other automatics. Aluminum bore wear.
Fix: Sonnax PR valve kit.
4. Solenoid issues
At 100K+ miles, solenoid issues common.
Fix: Solenoid replacement.
5. Input shaft failure (tuned applications)
Stock input shaft twists under tuned Cummins torque.
Fix: Billet input shaft (mandatory for tuned).
6. Pump bushing wear
Standard high-mile wear.
Fix: Pump bushing replacement.
7. Sun gear / planetary issues
HD applications stress the planetary gears.
Fix: HD sun gear or rebuild.
Common 48RE failures
1. Direct clutch wear (still #1)
HD use still wears the direct clutch.
Fix: HD direct clutch (or even more frictions in HD applications).
2. C clutch (overdrive) wear
Overdrive clutch sees high stress in highway tow.
Fix: HD C clutch pack.
3. Input shaft failure (severely tuned)
Even 48RE input can twist with enough power.
Fix: Billet input shaft for 1000+ ft-lb applications.
4. TCC apply piston issues
Common to many automatics.
Fix: TCC apply piston upgrade.
5. Valve body wear
Aluminum bore wear at high miles.
Fix: Sonnax bore correction kits.
6. Pump wear
Same as 47RE.
Fix: Pump rebuild.
Build recommendations
Stock 47RE / 48RE in non-tuned daily driver
- Alto Red Eagle master kit
- HD intermediate band
- Sonnax PR valve kit
- Stock-replacement solenoid pack
- HD torque converter (basic HD)
- Total parts cost: $700-1,200
- Build cost installed: $2,500-3,800
- Expected life: 150,000+ miles
Tow rig 47RE / 48RE (5,000-12,000 lb tow)
- Alto Power Pack master kit
- HD direct clutch with extra plate
- HD intermediate band
- Sonnax PR valve kit + TCC apply valve kit
- Performance HD torque converter
- TransGo shift kit
- Total parts cost: $1,200-1,800
- Build cost installed: $3,500-5,500
- Expected life: 100,000+ miles tow
Mild-tune 47RE / 48RE (Cummins 5.9L tuned 500-700 HP)
- Raybestos Stage-1 master kit
- HD direct clutch with extra plates
- HD intermediate band
- Billet input shaft (mandatory)
- Sonnax HD valve body upgrades
- Performance HD torque converter (diesel-spec)
- Performance valve body
- Total parts cost: $2,000-3,000
- Build cost installed: $5,500-8,500
- Expected life: 70,000+ miles tuned
Tuned 47RE / 48RE (Cummins 700-1,000+ HP)
- Race-spec frictions throughout
- Billet input shaft
- Billet output shaft (if available)
- HD planetary
- Race valve body
- Race-spec torque converter
- HD pump
- Total parts cost: $3,500-5,500
- Build cost installed: $9,000-15,000
- Expected life: Depends on use
Sled-pull / extreme tuned
- Race-spec everything
- Specialty components
- Custom valve body
- Race torque converter
- Total parts cost: $5,500-9,000
- Build cost installed: $15,000-25,000
Brand recommendations
Alto
- Red Eagle and Power Pack frictions
- Quality master kits
- Recommendation: Yes for stock to mild tune
Raybestos
- Stage-1 and GPZ
- Recommendation: Yes for tuned
Sonnax
- HD bore correction kits, PR valve kits, billet input shafts
- Recommendation: Yes — mandatory for tuned
ATI
- HD bands, performance components
- Recommendation: Yes for HD/performance
TransGo
- Shift kits and valve body upgrades
- Recommendation: Yes for tow/performance
ATS Diesel Performance
- Specialty diesel builds
- Valve bodies and converters
- Recommendation: Yes for tuned
BD Diesel
- Performance torque converters
- Recommendation: Yes
Suncoast Converters
- High-end diesel torque converters
- Recommendation: Yes for tuned
Goerend Transmission
- 47RE / 48RE specialty builds
- Recommendation: Yes for performance
Mopar (OEM)
- OEM 47RE/48RE parts
- Reliable but expensive
- Recommendation: Yes for OEM-spec
Fluid
47RE
ATF+3 originally — modern ATF+4 is the replacement.
Capacity: ~12 quarts total, ~5 quarts in pan.
Service: 30K severe duty, 50K normal.
48RE
ATF+4 (current spec).
Capacity: ~12 quarts total, ~5 quarts in pan.
Service: 30K severe duty, 50K normal.
Common rebuild mistakes
Mistake 1: Stock parts in tuned trucks
The most expensive mistake. Stock-spec 47RE/48RE rebuild + tuned Cummins = failure in 20,000-30,000 miles.
Mistake 2: Skipping the HD intermediate band
Stock band fails under HD use. HD band is mandatory for tow and tuned applications.
Mistake 3: Reusing input shaft on tuned trucks
Stock input will twist with serious power. Billet input is mandatory for 800+ ft-lb.
Mistake 4: Cheap torque converter
Diesel torque demands quality converter. Cheap converter = failure.
Mistake 5: Wrong fluid (ATF+3 vs ATF+4)
ATF+4 in 47RE is correct (backward compatible). But verify spec for your specific year.
Mistake 6: No external cooler
HD application without external cooler = early failure. Mandatory for tow rigs.
47RE / 48RE rebuild cost summary
DIY rebuild:
- Stock: $700-1,200
- Tow: $1,200-1,800
- Mild tune: $2,000-3,000
- Tuned: $3,500-5,500
- Race: $5,500-9,000
Shop rebuild installed:
- Quality independent: $2,500-4,000
- Performance shop: $5,500-9,000
- Race shop: $9,000-15,000
Reman swap:
- Quality reman 47RE: $2,500-3,200 installed
- Quality reman 48RE: $2,800-3,500 installed
- Built reman from specialty shop: $4,000-7,000
Specialty performance build (Goerend, ATS, BD):
- $5,000-10,000 typical
- Built specifically for application
47RE vs 48RE upgrade path
When to swap 47RE to 48RE
- Adding significant power
- Need higher torque capacity
- 47RE is failing anyway
- 48RE parts more available
Cost of 47RE to 48RE swap
- 48RE core: $1,000-2,000
- Build (if not already built): $1,500-3,500
- Installation: $500-1,000
- Total: $3,000-6,500
Considerations
- Output shaft length may differ
- TCM updates may be needed
- Bellhousing must match
For tuned applications: 48RE is the better starting point. Swap if you're already going to rebuild.
6.7L Cummins note
The 6.7L Cummins (2007.5+) uses the 68RFE or AS69RC transmissions, NOT the 47RE/48RE. The 47RE/48RE was only behind 5.9L Cummins.
If you have a 6.7L Cummins: see our [68RFE guide].
What we sell
Master rebuild kits for 47RE and 48RE with Alto and Raybestos frictions, Sonnax HD bore correction kits, billet input shafts, ATI HD bands, TransGo shift kits, performance torque converters from Goerend/ATS/BD.
Ready to rebuild your 47RE or 48RE? Shop our 47RE catalog or 48RE catalog. HD master rebuild kits, billet input shafts, performance valve bodies, diesel torque converters. Free shipping over $70. Same-day ship in-stock.
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