4R75W Solenoid Kit, new and ready to install. Fits the 4R75W. Ships fast from the USA.
The 4R75W is the heavier-duty version of Ford's 4R70W, used behind V8s in F-150s, Crown Victorias, Grand Marquis and Town Cars. When one starts holding a single gear, skips overdrive, shudders at cruise or throws solenoid codes, this new kit replaces the whole electrical package in one go. The listing photo shows the shift solenoid pack, the EPC (pressure control) solenoid, the TCC solenoid and the molded plastic lead frame that ties them to the case connector.
Each part in the kit has its own job. The twin-coil shift solenoid pack holds SS1/A and SS2/B, which the PCM switches on and off in four combinations to select 1st through 4th. The EPC solenoid is a variable force solenoid that sets line pressure - on this Ford design, less current means more pressure, so an unplugged EPC gives maximum pressure. The TCC solenoid applies the converter clutch at cruise. The lead frame replaces loose wires with a rigid molded carrier, and it is the piece most often overlooked when codes keep returning after a solenoid swap.
Ohm each circuit through the case connector. Sonnax lists 20-30 ohms for each shift solenoid, 10-16 ohms for the TCC solenoid and 2-5 ohms for the EPC; the EPC reads low by design, so do not condemn it for that. If every circuit reads open from the shared power terminal, the fault is one terminal or the lead frame, not four solenoids. If the electrical side checks good but shifts are soft under throttle, gauge line pressure - a worn pressure regulator bore bleeds off EPC oil and no solenoid will cure it. Our EPC solenoid symptoms guide covers that test, and the shift solenoid testing guide covers the gear-by-gear fault chart.
This kit is listed for the 4R75W, with an F-150 shown as the reference vehicle. The lead frame style matters more than the model name: Sonnax notes that later units moved from a molded lead frame to a soft wire harness, and the case connector changed between generations. Pull your pan and compare your lead frame, solenoid shapes and connector to the photos, or send us your year, model and VIN before you order. If you have a lighter-duty 4R70W, the 4R70W solenoid kit or the 2005-2008 4R70W solenoid kit may be the better match. Everything else for this family is in the 4R70W/4R75W collection.
All of these parts are serviced from under the pan. Unclip the old lead frame carefully so you do not crack the case connector, then fit new O-rings on each solenoid and set the frame so no wire is pinched by the valve body. Transmission Digest documented a rebuilt 4R70W that set fresh solenoid codes because a cheap case connector had two terminals pushed back, one of them the 12-volt supply, so seat every terminal and recheck resistance before the pan goes back on. Install a new filter and pan gasket and refill with Mercon V. Clear codes, reset adaptives and road test. If you are refreshing the shift feel at the same time, the 4R70W shift kit installs during the same service.
| Fits | 4R75W |
| Part type | Solenoid Kit |
| Condition | New |
| Brand | OEM |
| Reference | F150 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The listing photo shows a shift solenoid pack (SS1/A and SS2/B), an EPC solenoid, a TCC solenoid and the molded lead frame. Check the photos against your parts before ordering.
The two transmissions share the same solenoid control layout, but connectors and lead frames changed by year. Match the lead frame and connector to your unit, or send us your VIN and we will confirm fitment.
Per the Sonnax booklet: about 20-30 ohms for each shift solenoid, 10-16 ohms for the TCC and 2-5 ohms for the EPC, measured through the case connector.
The lead frame carries the shared 12-volt feed and every ground. Heat-cracked frames cause intermittent or multiple codes, and replacing it with the solenoids avoids pulling the pan twice.
Mercon V, per Ford's automatic transmission fluid chart. Do not add friction modifiers or other additives.
