Replacement 68RFE input shaft, OE 68029247AA, for 2007.5-2024 Ram 2500, 3500 and 4500/5500 cab-chassis trucks with the 6.7L Cummins diesel.
This is a factory-style replacement input shaft for the 68RFE six-speed behind the 6.7L Cummins, covering 2007.5 through 2024 Ram 2500 and 3500 pickups plus Ram 4500 and 5500 cab and chassis trucks. It replaces OE 68029247AA (68029247) and cross-references to 299600. Buyers usually land here after a rebuilder calls with bad news: the truck lost drive in every gear, and the shaft came out with its converter splines twisted or the shaft broken in two.
Torque leaves the converter turbine through this shaft and goes straight into the input clutch hub, which drives the underdrive, overdrive and reverse clutch packs. That makes the input shaft the single path for engine power into the gear train. The shaft also works as a hydraulic part: it rides inside the pump stator support, and the sealing rings and drilled passages carry oil to the clutches and the lube circuit. This replacement is forged alloy steel, induction heat-treated, with ground splines and drilled lube passages matched to the factory converter hub and input clutch hub. In plain terms, it is built to the original pattern, not as a performance upgrade.
A no-drive 68RFE is not always a broken shaft. Rule out low fluid, a failed pump and solenoid or switch valve faults first; our 68RFE valve body testing guide walks through those checks. If you have a scan tool, read input speed against engine speed with the selector in Neutral. Input speed comes from the input clutch hub, so a normal engine speed with input speed at or near zero is the classic sign that the shaft or its splines have let go. The speed sensor guide shows how to rule out a failed sensor or wiring first, since that can give the same zero reading.
Listed for 2007.5-2024 Ram 2500 and 3500, and Ram 4500 and 5500 cab and chassis, with the 6.7L I6 Cummins turbo diesel and 68RFE, 4x2 and 4x4, all cab styles. The 68RFE changed in 2010 and again in 2019, mainly in the solenoid pack and valve body, so match your OE number (68029247AA) and lay the old shaft beside the new one to compare length, spline counts and sealing ring grooves. Send us your year and VIN if you want a second check. Every 68RFE part we stock is on the 68RFE collection page.
An OE-pattern shaft like this one is the right call for a stock truck, a work truck towing inside its rating, or a fleet unit going back to factory spec. If the engine has been tuned, has bigger injectors or tows near the limit at full lockup, the factory design is the weak link; in that case look at our 300M billet 68RFE input shaft instead.
Because the unit has to come apart anyway, most shops install this shaft with a full 68RFE overhaul kit. For other weak points worth fixing on the same teardown, see our 68RFE Ram 3500 Cummins common problems guide.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for 2007.5-2024 Ram 2500, 3500 and 4500/5500 cab and chassis trucks with the 6.7L Cummins and 68RFE. Match OE number 68029247AA and compare the old shaft side by side, or send your VIN and we will check it.
No. This is a forged, induction heat-treated shaft built to the factory pattern. The billet version is 300M steel aimed at tuned and heavy towing trucks. Pick this one for a stock truck going back to factory spec.
The engine revs but the truck will not move in any gear, often after a clunk under load. Metal in the pan and an input speed reading near zero in Neutral while the engine is running back it up.
Only if its hub splines are worn. A converter with stepped splines will chew up a new shaft, so inspect it closely and replace or rebuild it if the splines are damaged.
The shaft has no electronics, but the transmission is rebuilt around it. Refill with ATF+4, set the level hot, clear codes and run the quick learn or adaptive reset with a capable scan tool after any rebuild.
