4R75W Sun Shell, used and ready to install. Fits the 4R75W. Ships fast from the USA.
The 4R75W was Ford's heavier-duty answer to the 4R70W, and it went into the vehicles that work their transmissions hardest: Crown Victoria Police Interceptors, the Mercury Marauder, Mustang GT and Mach 1, and 5.4L Expeditions and E-Series vans. When one of those starts flaring on the 1-2 shift, drops overdrive or loses Reverse, a cracked sun shell is a real possibility. This is a used OEM 4R75W sun shell, a good-condition original part for owners and shops rebuilding one of these units.
Inside the 4R75W is a single compound gearset with a forward sun gear and a reverse sun gear. The sun shell carries the reverse sun gear on its top and drops down around the forward clutch area, where tabs at its lower edge engage the reverse clutch drum. Hold that drum and the gearset gives second or overdrive; drive it and you get Reverse. The intermediate clutch and its one-way diode handle the hold in second, the overdrive band handles it in fourth. On a Police Interceptor or a towing Expedition, those shifts happen under a lot of torque, and the stress collects at the base of the gear.
Several cheaper faults copy these symptoms. A worn overdrive servo bore, a burned intermediate clutch, a bad shift solenoid or low EPC pressure can all cost you second and fourth. Scan for codes, check pressure and inspect the pan before ordering hard parts. The Crown Victoria common problems guide walks through the police-car failures, including the valve body and servo issues, and the Expedition shift problems guide covers the 5.4L trucks. If the electrical and hydraulic checks pass and the pan is full of steel, pull the unit and look at the shell for a crack around the gear or bent tabs.
This shell is listed for the 4R75W without a specific year, so match it to the one you remove. The 4R75W arrived in 2003 and Ford upgraded the sun shell for 2004, with a stronger stamping, a lower bearing surface and a thicker bearing. ATRA says the late shell, bearing and forward sun gear must stay together as a set or end play will be off. Compare the gear, tab pattern and the height to your bearing surface against your original. If your tag says 4R75E, ATRA notes that version needs a non-magnetic shell for its turbine speed sensor, so confirm before you install. Send us your year and VIN if you want us to check. A new 2004 4R75W sun shell is also listed, and every part for this family is in the 4R70W and 4R75W collection.
| Fits | 4R75W |
| Part type | Sun Shell |
| Condition | Used |
| 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.
The two units share the same basic design, but the shell changed for 2004 and the electronic 4R70E/4R75E versions need a non-magnetic shell. Match your original part rather than the model name alone.
Those three ranges all depend on the reverse sun gear, which is part of the shell. Once the shell cracks, the clutch or band can no longer hold or drive the gear, so the transmission flares or goes to neutral in those ranges.
A clean used OEM shell with no cracks and good splines is a sound repair. If your old shell is the 2004-up design or you are converting to the late parts, a new 2004 shell keeps the matched set together.
The thrust bearing, filter and any frictions contaminated with debris. Inspect the forward sun gear, carrier, drum tabs and pump, and flush the cooler.
MERCON V for the 4R75W years covered by Ford's guides we reference. Some 2009-up Panther cars with the 4R75E moved to MERCON LV, so check your owner guide if your vehicle is later.
