i dont really know if it is the transmission are the rear end but when i go down the highway and let off the gas than give it more gas i get a big thump like my trans. is slipping than is grabs and jumps anyone having this issue with the 2010 f150 fx2 model thanks

 

ok and?

 

dfvvv

 

i have this issue on my 08, it happens a t lower speed like 39-40.
The tranny needs to be reprogrammed on mine. Its a common problem on the 08's maybe same as yours.

 

it is doing it at about those speeds i guest they can reprogram it at the dealer if they say there is a problem , i had a ac issue with the same truck they could not find anything untill the ac went out completly

 

Which engine is in your truck? I have a 2010 xl 4.6 and one time while on interstate at about 50 I punched it and it felt like a slip and then a loud thump then took hold. My wife was with me and she even ask what happened? I have about 2500 miles on truck. Just wandering if you have the same tranny as me. Mine is 4 speed auto.