Replaces the 926-149 / AL3Z-7G276 lead frame on Ford 6R80 transmissions, with connector, seal and filter, to cure no-shift, limp mode and speed sensor codes.
A Ford 6R80 that shifts fine cold and then turns harsh, flashes the gear display or falls into limp mode once it is hot is a classic lead frame complaint. This kit replaces the lead frame (926-149, AL3Z-7G276-B and -D) in the 6R80 found in the Expedition, Navigator, Mustang, Transit, F-150 and 6.2L Super Duty, and it adds the parts you touch on the way in: the valve body pass-through connector, its seal and a new pan filter.
The 6R80 has no separate transmission computer. The powertrain control module runs it, and the lead frame is how that module talks to the inside of the case. The frame carries the circuits to the shift and pressure control solenoids, and it carries four sensors in one plastic part: turbine shaft speed, output shaft speed, the transmission range sensor that reads the manual valve position, and the fluid temperature sensor. Because the temperature sensor sits on the lead frame directly under the low/reverse clutch pack, the frame lives in some of the hottest fluid in the unit. Years of heat cycling are what crack the molded traces and solder joints, and that is why so many of these failures start out intermittent and temperature dependent.
Log transmission data on a scan tool through a full warm-up drive. A failing lead frame usually shows one sensor going flat or spiking while everything else stays steady. Pay attention to the fluid temperature PID, but do not read it in isolation: Transmission Digest documented a 2013 F-150 where a PCM and a valve body with a new lead frame were both installed and the erratic temperature reading stayed, because the real cause was an overheated low/reverse clutch pack stacked too tight sitting right above the sensor. Check the reading against an infrared thermometer on the pan, and treat burnt fluid as a sign of a clutch problem, not a sensor one. The 6R80 common problems guide covers the other faults that share these codes.
Listed for the 6R80 in the 2012-2017 Expedition and Navigator, 2011-2017 Mustang, 2015-2019 Transit, 2010-2020 F-150 and 2017-2020 F-250/F-350 with the 6.2L. Make sure your vehicle actually has the 6R80, since the same models were also built with other Ford transmissions in some years. Then match the part number on your old lead frame to 926-149 or AL3Z-7G276-B/D, or send your year, model and VIN and we will confirm it. Expedition and Mustang owners can find model-specific failure patterns in our 6R80 Expedition guide and 6R80 Mustang guide, and the full 6R80 parts collection lists matching valve body parts.
Drain the fluid, drop the pan and remove the filter, then unplug the internal connector and remove the main control assembly. The lead frame is held to the valve body by six long bolts. Move the solenoids across, seat the new frame so the range sensor pin engages the manual valve, and tighten the bolts in sequence to 53 lb-in. Press in the new pass-through connector with its seal, since the original seal hardens and commonly weeps once disturbed. Install the new filter, reinstall the pan and fill with Mercon LV, then clear codes and relearn adaptives. This kit includes a filter but no pan gasket, so plan on a gasket or a new 6R80 pan with drain plug and gasket. If heat is the reason the frame failed, adding a 6R80 transmission oil cooler is cheap insurance for a truck that tows.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The powertrain control module controls the 6R80. The lead frame only carries the wiring and the speed, range and temperature sensors, so replacing it does not replace or require a new computer.
The lead frame sits in hot fluid under the low/reverse clutch pack, and cracked traces or joints often open up only as the plastic expands with heat. That is why many 6R80 lead frame faults are intermittent and clear after a restart.
On the 6R80 the speed sensors, range sensor and temperature sensor are molded into the lead frame. If one of those circuits has failed, the lead frame is the replacement part.
The kit includes the lead frame, valve body connector, connector seal and filter. Order a pan gasket or a new pan with gasket separately, plus Mercon LV fluid for the refill.
Check the actual pan temperature with an infrared thermometer. A tight or burning low/reverse clutch pack directly above the sensor can drive the reading up and down even with a new lead frame, and that is a clutch clearance problem.
