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Old 11-24-2013, 06:31 PM
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Question Transmission/driveline "Bump/Thud" while driving

I've read many other threads on this on these forums. I also noticed it soon after getting my '13 T-Hawk. I noticed it at highway speeds. It was quite disturbing because it was very abrupt. I noticed it when I was cruising at highway speeds and gently accelerating up a hill while the engine was in "ECO" mode. These were the only times it occurred. I believe it to be the shift from "ECO" to V8 mode with the additional load of the incline. I noticed it does not occur if I either more gently apply the throttle or accelerate before/after I crest the incline. Is this the problem that others are encountering? I am not so sure its a big issue and just the driveline loading the other four cylinders. I had a Ford F150 with an Ecoboost and many folks were commenting on their boards about the mileage not living up to the "hype". I noticed that if I let the computer drive the vehicle I was meeting the mileage as advertised. I wonder if this is also just a matter of just letting the "brain" do the work and if I want it to drive more conventionally, I just put it Tow/Haul mode and drive it the way I drive any other vehicle- it never occurred in Tow/Haul mode and has not since I changed the above mentioned driving habits.

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