If you bought a Dodge Ram 2500 or 3500 with a 6.7L Cummins between 2007.5 and present, you have a 68RFE transmission. If you tow with it, tune it, or just put a lot of miles on it, you'll eventually rebuild it.
This guide is from someone who's actually torn dozens of these apart, not from a forum post written by someone who read a brochure.
What kills the 68RFE
The 68RFE has a few weak links that show up over and over:
1. OD direct clutch pack
Under high torque or tow loads, the OD direct clutch is the first to burn. Eight friction plates, stock material, repeated apply under load = heat = glaze = slip = burn.
If you've delayed service or run a tune, this is gone first. The clutch pack disintegrates into the converter, contaminates the fluid, and metal works its way through the entire transmission.
Replacement: Updated OD direct clutch pack. Always replace all 8 friction plates and steel plates. Never reuse.
2. Input drum cracking
The 68RFE input drum has a snap ring groove that's a known stress riser. With a tune or hard use, it cracks at this point and dumps the drum into the case.
Visual: Pull the input drum, inspect the snap ring groove with a magnifying glass. Any crack = replace.
Solution: Billet input drum. If your truck has any tune above stock, this is not optional. About $400-500. One-time install. Will not crack.
3. Pump cavitation
The 68RFE pump has a marginal inlet design. Under sustained high-rpm towing, the pump can cavitate, lose prime, and the resulting pressure drop burns the clutches that need pressure to apply.
Symptom: Harsh shifts at high engine RPM, especially when the trans is hot.
Solution: Updated pump or pump kit. Several upgraded pump options exist. Goerend offers a full pump assembly.
4. Valve body wear
Aluminum bores wear over time. The 68RFE valve body has multiple critical bores that affect line pressure, apply timing, and TCC operation.
Solution: Send the valve body for ultrasonic cleaning and Sonnax bore corrections, OR replace with a Goerend or aftermarket pre-built valve body. The Goerend is the gold standard for tow trucks and tuned applications.
5. Solenoid pack failure
Eventually all the solenoids in a 68RFE pack will fail. Heat cycling over hundreds of thousands of shifts ages them.
Solution: New solenoid pack during any major rebuild. Don't try to swap individual solenoids - the labor isn't worth it.
Mandatory replacements on every 68RFE rebuild
These are not optional. Skip any of these and you'll be back in the case in under 50,000 miles:
- OD direct clutch pack (always burned)
- OD clutch pack (8 frictions, never reuse)
- Forward clutch pack
- Direct clutch pack (front)
- All 12 lip seals
- All sealing rings
- Pan gasket (single-use)
- Filter
- Pump assembly inspection (replace if any cavitation evidence)
- Valve body inspection and clean (minimum)
- Solenoid pack (if any codes or 100K+ miles)
Upgrades that prevent the same failure twice
If you tune, tow, or run higher horsepower than stock, install these from the start:
Billet input drum (~$450)
The single most important upgrade. Will not crack. One-time install.
Billet flexplate (~$300)
Stock flexplate cracks at higher torque levels. Billet stays solid through 800+ ft-lb.
Goerend valve body (~$800)
Full pre-built unit with updated valves, bores, and apply circuit corrections. Drops the rebuild risk on valve body work to near zero.
Upgraded torque converter (~$700-1,200)
The factory converter is fine for stock. For tunes or towing above 12,000 lb, a triple-disc converter is required.
Auxiliary cooler upgrade
Stock cooling is marginal for towing. Add a stacked-plate aux cooler with fan. About $200-400.
Service items to never skip
These cost almost nothing and prevent the rebuild:
- Synthetic ATF+4 (use the GOOD stuff, not generic)
- New filter every service
- Pan magnet inspection (any metal = imminent failure)
- Check cooler lines for flow restriction
- Verify TCM software is current
Service interval reality
Chrysler/Stellantis says 60,000 miles for normal service. For Cummins owners, "normal" doesn't apply. If you tow even occasionally, service every 30,000 miles. If you tow heavy or have a tune, service every 20,000-25,000 miles.
I've torn down 68RFEs at 80,000 miles where the customer "never had a problem" - and the fluid was burnt black, OD clutches were toast, and they were three months from a full failure. Service the transmission. It's $200 every 30K vs $4,000-7,000 every 100K.
Realistic rebuild costs
Parts only:
- Budget rebuild (stock truck, no upgrades): $900-1,300
- Tow-grade rebuild (with billet drum, updated valve body): $1,800-2,500
- Performance rebuild (full billet, Goerend, triple disc converter): $3,500-5,000
Labor:
- DIY: free (40-60 hours your time)
- Shop labor: $1,200-2,000
Full out-the-door rebuild from a competent shop: $4,500-7,000 for a tow truck, $7,000-10,000 for a deleted/tuned setup with full upgrades.
When to walk away
If you find:
- Cracked case (especially near the pump or output shaft)
- Bell housing damage
- Heat-discolored hard parts (sun gears, planetaries)
Source a known-good used 68RFE core and rebuild that. Used cores are $1,000-1,500. Cheaper than fighting a damaged case.
Common questions
Can I rebuild a 68RFE in my garage?
Yes, if you have basic transmission rebuild experience and a clean workspace. The 68RFE is mechanically straightforward. You'll need a transmission jack, a clean parts table, and the ATSG service manual.
How long does a properly rebuilt 68RFE last?
Stock-tuned daily/light tow: 200,000+ miles
Heavy tow (loaded RV, 5th wheel): 100,000-150,000 miles
Tuned and deleted: 80,000-150,000 miles depending on tune aggression
Should I rebuild or replace with a reman?
Reman 68RFEs from Jasper or AAMCO run $4,500-6,000 with core. If you can do the work yourself, parts-only is $1,200-2,500 and you control quality. Reman has a warranty. Both are valid choices.
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Need 68RFE parts? Shop our 68RFE catalog - complete master rebuild kits, billet input drums, Sonnax updates, solenoid packs. Same-day shipping on stock parts. Wholesale pricing for shops.
Related guides:
- Cummins 68RFE vs Allison 1000 - which is better
- Tow tuning a Cummins without killing the trans
- Goerend valve body installation walkthrough