6R140 Sun Shell, remanufactured and ready to install. Fits the 6R140. Ships fast from the USA.
If your F-250, F-350, F-450 or F-550 Super Duty with the 6R140 TorqShift has started to whine with road speed, dropped a gear, or left glitter and chunks of metal in the pan, the rear gear train is one of the first places a rebuilder looks. This listing is a remanufactured 6R140 rear planet supplied with both of its sun gears: the 47-tooth reaction sun gear and the 37-tooth rear planet sun gear. It is sold under our sun shell listing because the sun gears are what most people are hunting for, but you get the complete rear planet set described here, not a bare shell.
Ford Component Sales describes the 6R140 as a Lepelletier powerflow: one simple planetary up front feeding one Ravigneaux gear set at the back, with five clutch packs, three rotating and two brake clutches. The Ravigneaux set is this part. It has a single carrier with long and short pinions and two sun gears. One sun gear is driven by the forward clutch, the larger reaction sun gear is driven by the direct (3-5-R) clutch or held by the intermediate (2-6) clutch, and the carrier is either driven by the 4-5-6 overdrive clutch or held by the low/reverse clutch. Output leaves through the ring gear. Every forward gear and reverse passes through this assembly, which is why damage here usually shows up in more than one range at once.
Ratio codes can also come from a slipping clutch or a speed sensor fault, so rule those out first. Our 6R140 speed sensor guide covers the sensor side, and the 6R140 TorqShift rebuilder's guide walks through the known valve body and clutch failures that mimic a mechanical problem. A gear train failure usually leaves physical evidence: metal on the magnet, pinions with blue heat marks or rough rotation, chipped sun gear teeth, or worn splines where the sun gears engage their drums.
The listing names the Ford 6R140 without a year range. The 6R140 appears in 2011-and-later Super Duty trucks with the 6.7L Power Stroke diesel and the 6.2L and 7.3L gas engines. Ford revised this transmission during production, so compare the tooth counts (47 on the reaction sun, 37 on the rear sun), the spline pattern and the overall height of your old parts before installing. If you are unsure, send us your year and VIN and we will check it. You can see every part we carry for this unit on the 6R140 parts page.
A failure that sends metal through the unit usually means the clutches and seals need attention too, so most builders pair this part with a 6R140 master rebuild kit and a fresh filter and MERCON LV service kit. If the forward or direct drum splines are worn, replace the drum at the same time.
| Fits | 6R140 |
| Part type | Sun Shell |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. Despite the listing name, this is the remanufactured 6R140 rear planet supplied with the 47-tooth reaction sun gear and the 37-tooth rear planet sun gear.
The listing covers the Ford 6R140 without a year split. Compare tooth counts, splines and height with your original parts, or send us the year and VIN and we will confirm before it ships.
Replace worn thrust washers and bearings, inspect the mating drums and hubs, and if the old gear set put metal through the unit, plan on a full rebuild kit, a new filter and a cooler flush.
Ford specifies MERCON LV. Total capacity is roughly 4 gallons, and the level should be checked hot after the repair.
The gear set itself has no calibration, but if the unit was opened for a rebuild, reset the adaptive shift values with a scan tool and complete a road test so the controller relearns clutch timing.
