Chrysler 68RFE 6-Speed Automatic

Paired with: Dodge/Ram 2500-3500, 6.7L Cummins (standard output)

The standard automatic behind the 6.7L Cummins from its mid-2007 introduction onward, and still offered as the base automatic on current high-output-optional trucks. It prioritizes shift comfort and has a documented set of factory weak points that the higher-capacity Aisin AS69RC (offered on high-output trucks) was introduced to address.

Strengths

• Long production run with correspondingly deep aftermarket support for rebuilding it to handle more power.
• Smooth, comfort-oriented shift calibration compared to some heavy-duty automatics.

Known weaknesses

• The overdrive clutches are the most common failure point: a thin design with poor heat dissipation that is prone to warping under towing or added power.

  Note: Upgraded overdrive clutch packs are a standard build item.

• The torque converter is comparatively weak and prone to overheating and ballooning under load, causing shudder or RPM flare.

  Note: An upgraded torque converter is a common first upgrade for towing use.

• The valve body is fragile; cross-leaks and separator-plate wear degrade shift quality over time.

  Note: A re-valved or aftermarket valve body addresses this.

• Input and output shafts are weak points under added power or towing stress and can twist or snap.

  Note: Billet shafts are a standard upgrade for anything beyond stock power.

Sources

• 68RFE Transmission Guide: Problems & DIY Upgrades (Diesel Power Products) (accessed 2026-09-22)
• Chrysler 68RFE Transmission, Problems, Solutions & Upgrades (NextGen Diesel) (accessed 2026-09-22)