Indexes the overdrive splines on Dodge 46RE, 47RE and 48RE transmissions so the overdrive unit slides onto the shaft and seats square.
If you have the overdrive unit off a Dodge Ram 46RE, 47RE or 48RE and it will not slide back onto the intermediate shaft, the planetary and overrunning clutch splines have almost certainly rotated out of line. This splined alignment shaft is made to stop that from happening. It fits the 46RH, 46RE, 47RH, 47RE and 48RE used behind the gas V8s and the 5.9L Cummins, and it does the job Chrysler assigns to its own special tool 6227-2 in the factory service manual.
The overdrive section bolts to the back of the main case as a separate unit. Inside it, the overdrive planetary gear and the overrunning clutch hub both ride on the intermediate shaft splines. Once the unit is off the shaft, nothing holds those two internal splines in line with each other. Tilt the unit, set it down on its nose, or bump the output shaft and they turn independently. The factory manual is blunt about the result: if the splines rotate out of alignment, the overdrive unit cannot be installed and has to be taken apart to realign them.
The tool is a solid shaft with a splined section and a pilot tip. Pushed in through the sun gear, it engages both hubs at once and locks them in the same index. The manual calls for it in three places: right after the overdrive comes off a transmission that only needs main-case work, during overdrive overhaul before the direct clutch spring goes back in, and as a keeper while the finished unit waits on the bench.
Before you split the case, diagnose. Slipping only in fourth, or slipping in fourth and reverse, points at the overdrive clutches; slipping in every gear points elsewhere. Our 46RE 3-4 clutch failure guide walks through the symptoms and pressure checks, and the 46RE common problems guide covers the governor pressure and valve body faults that get mistaken for clutch wear. Look at the fluid when the pan comes off; the manual says clutch material or metal in the overdrive drain-off means the unit needs overhaul.
The listing covers the 46RH, 46RE, 47RH, 47RE and 48RE: Dodge Ram 1500, 2500 and 3500 gas trucks and the 5.9L Cummins diesel trucks that ran the A518 and A618 four-speed families. These share the same overdrive layout with the planetary and overrunning clutch splined to the intermediate shaft. It is not for the 45RFE, 545RFE or 68RFE, which use a different design. If you are not sure which transmission is in the truck, check the identification tag on the case, or send us your year and VIN and we will confirm it. You can browse everything we carry for these units on the 46RE parts page.
If the overdrive is coming apart anyway, pair this with the overdrive direct clutch spring compressor and a full 46RE master rebuild kit. Refill with ATF+4 and check the level hot.
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Yes. The listing covers the 46RH, 46RE, 47RH, 47RE and 48RE, and the 48RE kept the same overdrive arrangement with the planetary and overrunning clutch splined to the intermediate shaft. It does not fit the 45RFE, 545RFE or 68RFE.
The planetary gear and overrunning clutch hub can rotate out of line with each other. The Chrysler service manual states that once that happens the overdrive unit cannot be installed and must be disassembled to realign the splines. The tool prevents that.
It does the same job: a splined shaft inserted through the sun gear into the planetary and overrunning clutch hubs to keep them indexed. Chrysler lists 6227-2 as the alignment shaft for this step in the 46RE and 47RE overdrive procedures.
Leave it in from the moment the overdrive comes off until you are ready to install it. Slide it out, then lift the unit and slide it straight onto the intermediate shaft without tilting it.
ATF+4. Refill, run the engine, and check the level with the fluid at operating temperature in Neutral as the manual describes.
