I am reporting a serious intermittent transmission and loss-of-propulsion problem with my 2021 Lincoln Navigator, VIN 5LMJJ3LT6MEL05416. While driving, including at highway speeds, the transmission will unpredictably behave as though it has shifted into Neutral even though the vehicle remains in Drive. When I press the accelerator, the engine responds, but the vehicle temporarily has little or no propulsion. The transmission may then suddenly re-engage and slam or bang forcefully back into gear. This can also happen under very light throttle. I may gently press the accelerator expecting normal acceleration, but instead the vehicle acts as though it is in Neutral before suddenly engaging again. The condition is intermittent and cannot be reliably reproduced on demand, which makes it especially dangerous and unpredictable. I am concerned about losing propulsion while merging, passing, entering traffic, or attempting to accelerate away from another vehicle at highway speeds. The vehicle has previously had transmission adaptive learning/reset procedures performed, but the problem continues. I am aware that Ford/Lincoln has issued technical service information addressing momentary neutral-out, delayed engagement, harsh engagement, and other 10R80 transmission concerns on this generation of Navigator. I am also aware of Ford recall 26S48 / NHTSA recall 26V402 involving certain 2018–2021 Lincoln Navigators. I am not claiming that the recall is definitively the cause of my specific condition, but I believe this intermittent loss of propulsion presents a serious safety concern that should be investigated. I am requesting that NHTSA document and investigate this loss-of-propulsion / neutral-out condition because the vehicle can unexpectedly fail to accelerate and then violently re-engage the transmission while in motion.

Source: NHTSA complaint ODI #11760540 · view all complaints for this vehicle at nhtsa.gov

Car purchased in Feb 2022. November 9, 2023 after a couple of previous complaints about the car riding rough, this time , after telling them the car jumps and throws into the next lane, it was diagnosed as having passenger rear leaking strut, front pinion seal leak, front driveshaft c/v joint torn and leaking grease. These were repaired under warranty. Dec 2024: had noise and had vibration felt through floorboard - diagnosed with problem in front differential and found carrier bearing failure and damage to case from bearing failure/spun. The axle housing assembly was replaced. April 2025: transmission shifting hard and clunk noise as well as riding rough again. These transmission assembly will be repaired for known problems on original 10 speeds but they don’t fix until customer complains, the rear differential pinion seal is leaking and the front struts are leaking. Something is very wrong with the suspension, drive train and transmission in this vehicle.

Source: NHTSA complaint ODI #11657789 · view all complaints for this vehicle at nhtsa.gov