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The Aisin AS68RC is the six-speed automatic Ram offered behind the 6.7L Cummins in the 3500 cab-and-chassis and the 4500/5500 medium-duty trucks starting with the 2007.5 model year. It is a commercial-grade unit with a PTO provision, and it lives a hard life: payload, towing, idle time and heat. Parts are Aisin-specific, so a rebuild is not a place to guess.
Short version: these trucks work for a living, so buy a master kit matched to your build year, and budget for the valve body and pump inspection that almost every high-hour unit needs.
Which Kit Fits Your Situation
| Kit | Contents | Best for |
|---|---|---|
| Overhaul kit | Gaskets, seals, O-rings, sealing rings | Leak repair, or a unit opened early with clean fluid |
| Banner kit | Overhaul kit plus frictions | Worn frictions with steels that are still flat and not heat-blued |
| Master kit | Overhaul kit plus frictions and steels | Slipping, flare under load, burnt fluid, high hours. The right call for most trucks |
In stock: the AS68RC master rebuild kit, the Remco AS68RC master rebuild kit, the AS68RC banner rebuild kit and the AS68RC overhaul kit. For what the tier names really mean, see rebuild kit vs master overhaul kit.
Match the Kit to Your Year
AS68RC kits are listed by year range because internal revisions happened over the production run. Our listings show the split, for example the 2006-2011 master kit, the 2007-2012 master kit and the 2007-2014 master kit, with overhaul kits split the same way.
Confirm by the transmission's ID tag and the truck's build date. On a unit that has been rebuilt before, do not assume the internals are original. Compare the old seals, rings and plates against the kit on the bench before assembly.
What Wears Out Inside an AS68RC
- Clutch packs. Behind 6.7 Cummins torque, the apply clutches glaze and burn first on trucks that tow heavy or run hot. Slip or flare on upshifts under load is the classic sign.
- Valve body and solenoids. Debris from slipping clutches scores the bores and sticks solenoids, which causes harsh shifts, ratio codes and limp mode. Inspect the AS68RC valve body and pressure control solenoid on every rebuild.
- Pump. Worn pump gears and bushings drop line pressure and starve every clutch. A worn unit needs a replacement AS68RC pump.
- Drums and planetaries. Heat cracks drums and wears planetary pinions. Check the clutch drum, input drum and planetary before you reuse them.
- Internal harness and pass-through connector. Chafed or fluid-soaked wiring throws solenoid codes that mimic mechanical failure. The AS68RC internal wiring harness is cheap to replace while it is apart.
If the truck is in limp mode with clean fluid and no slip, read our AS68RC limp mode fix before you pull the transmission. A harness, connector or solenoid problem costs a fraction of a rebuild.
Replace These While It Is Apart
- Filter and pan gasket. The AS68RC filter kit with gasket. Never reuse the filter.
- Cooler. Flush the cooler and lines until the fluid runs clean, or replace the cooler if it is plugged. A healthy AS68RC transmission cooler is what keeps the new clutches alive under load.
- Temperature monitoring. If the truck tows, watch transmission temperature. Sustained high temperature is what kills AS68RC clutches and fluid.
Fluid and Relearn
The AS68RC is an Aisin unit and uses the Aisin-spec fluid Ram calls out for it, not the ATF+4 used in the 68RFE. Check the owner's manual or service information for your truck and use the fluid it specifies. The wrong fluid shows up as shudder, harsh shifts and early clutch wear.
After a rebuild or a valve body or solenoid replacement, reset the transmission adaptives with a scan tool that supports Ram transmission functions, then drive it through all six gears under light and moderate throttle so the TCM can relearn shift timing.
Common Mistakes
- Rebuilding the clutches and reinstalling a worn valve body or pump.
- Skipping clutch clearance checks and air checks before the valve body goes on.
- Using a kit from the wrong year range.
- Filling with ATF+4 because it is a Ram.
- Putting a rebuilt unit back in a truck with a plugged cooler and no temperature gauge.
AS68RC Kits Ship Same-Day
Master kits, overhaul kits, valve bodies, pumps, drums and the internal harness are in our Aisin section. Need a hard part we do not list? Our sister shop CoreTransmissionParts.com carries the deeper hard-parts catalog.
Shop Aisin Parts → All Rebuild KitsFAQ
What is the best AS68RC rebuild kit?
For most working trucks, a master rebuild kit matched to your year range. It replaces the frictions, steels, seals, gaskets and sealing rings together. Overhaul and banner kits only make sense when the steels and other wear parts are still in good condition.
Which trucks use the Aisin AS68RC?
Ram 3500 cab-and-chassis and 4500/5500 medium-duty trucks with the 6.7L Cummins, starting with the 2007.5 model year.
Does the AS68RC use ATF+4?
No. The AS68RC is an Aisin unit and uses the Aisin-spec fluid Ram specifies for it. Check your owner's manual or service information and do not substitute ATF+4.
Is the AS68RC the same as the AS69RC?
No. They are related Aisin six-speeds, but many internal parts and kits are not interchangeable. Buy kits listed for your exact transmission.
What should I replace with an AS68RC rebuild kit?
The filter, and any worn valve body, pump, drum, planetary or internal harness. Flush or replace the cooler before the rebuilt unit goes back in.