Hi Guys,

I have a 2017 F150 Lariat with 70k on it. Recently the transmission start to slip from gears, 1-2 and 5-6. other than that runs fine. I tried a fluid flush and flash the computer. still the same issue. Any ideas on what it can be?

 

assuming this is a six speed, i would try a filter change. if that doesn't work its probably a valve body issue.

 

Thanks Brian. it is the 10 speed. although Im not sure if that changes anything.

 

you said flush so im assuming its the original filter. I would try a pan drop with a new filter with new fluid. if thats doesnt fix it, then its more than likely something wrong with the valve body.

 

Make sure you have the correct amount of fluid. Use the mini dipstick to check the level and make sure the transmission is warmed up and running in park before you check it. A couple of quarts can make a big difference.