The 68RFE transmission was introduced in 2007.5 Ram 2500 and 3500 pickups paired with the 6.7L Cummins diesel. While smoother than the older 48RE, the 68RFE is notorious for overheating, torque converter shudder, and clutch pack failures when subjected to heavy towing or aftermarket tuning.
At DK Auto & Diesel Service in Magnolia, TX, we rebuild and upgrade the 68RFE to outlast its factory weaknesses.
Common Dodge/Ram 68RFE Transmission Problems & Symptoms
1. Valve Body & Solenoid Pack Failure
• Symptoms:
◦ Harsh, delayed, or erratic shifts
◦ Limp mode (stuck in 4th gear)
◦ Codes like P0750, P0871, P2714
• Causes:
◦ Weak solenoid pack design
◦ Cross-leaks in valve body bores
• Fixes:
◦ Replace/upgrade solenoid pack
◦ Rebuild valve body with Sonnax or TransGo kits
◦ Line pressure recalibration
2. Torque Converter Shudder / Failure
• Symptoms:
◦ Vibration or shudder at 40–60 mph
◦ RPM flare under load or while towing
◦ Poor fuel economy
• Causes:
◦ Stock single-disc converter can’t hold Cummins torque
◦ Excess slip generates heat
• Fixes:
◦ Upgrade to billet triple-disc torque converter
◦ TCM tuning to optimize lockup
◦ Cooler line flush with fluid exchange
3. Overheating Under Tow/Load
• Symptoms:
◦ Transmission over-temp warning
◦ Fluid turns dark or smells burnt
◦ Limp mode on long grades or heavy tow
• Causes:
◦ Insufficient stock cooler capacity
◦ Converter slip creating excess heat
• Fixes:
◦ Install auxiliary or larger-capacity cooler
◦ ECM/TCM tuning to reduce slip and increase line pressure
◦ Service fluid every 25k–30k miles when towing
4. Clutch Pack Failure
• Symptoms:
◦ Slipping in 4th, 5th, or 6th gear
◦ Gear ratio error codes
◦ Metallic debris in pan
• Causes:
◦ Under-designed clutch packs (C2/C3)
◦ Line pressure too low under load
• Fixes:
◦ Rebuild with heavy-duty clutch packs & steels
◦ Increase line pressure with valve body calibration
◦ Billet apply pistons for better holding power
5. Input Shaft & Hard-Part Failures (Tuned Trucks)
• Symptoms:
◦ Sudden loss of drive under high load
◦ Loud snap/clunk, truck won’t move
• Causes:
◦ Stock input shaft twisting/snapping on high horsepower
◦ Planetary or drum failures in extreme cases
• Fixes:
◦ Upgrade to billet input/output shafts
◦ Full HD rebuild with billet drums and planetary sets
How DK Auto & Diesel Fixes the 68RFE
We build 68RFEs to handle towing, daily use, and tuned Cummins power:
- Billet triple-disc torque converters
- Heavy-duty clutches, steels, and billet shafts
- Valve body upgrades (Sonnax / TransGo)
- Auxiliary cooler installs for Texas towing
- ECM/TCM tuning for shift pressure & longevity
- 24-month / 24,000 mile warranty
Schedule Your Dodge/Ram 68RFE Transmission Diagnostic in Magnolia, TX
If your 68RFE is slipping, shuddering, or overheating, get it inspected before major failure. Bring it to DK Auto & Diesel Service for diagnostics and upgrade options.
Serving Magnolia, Montgomery, Conroe, The Woodlands, Tomball, Willis, and Spring.
Book a Transmission Diagnostic Today
FAQ About Dodge/Ram 68RFE Transmissions
Why is the 68RFE considered weak?
- Its stock valve body, solenoids, and clutches aren’t strong enough for tuned Cummins power or heavy towing. Upgrades are almost always needed.
How much power can a built 68RFE handle?
- Stock units are reliable up to ~400 hp. With billet shafts, clutches, and converters, they can handle 700–1,000 hp.
How often should the 68RFE be serviced?
- Every 60k miles in stock/tow use, or every 25k–30k miles for tuned/heavy hauling trucks. Always use ATF+4 synthetic fluid.
