Happy Tuesday!
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3rd Gear
Joined: Apr 2024
Posts: 3
Likes: 0
From: Tennessee
Happy Tuesday!
I have a 2019 F350 SD 6.7 diesel, 4 WD. I have noticed a couple times it will shift HARD while driving from 6-5th gear. It feels like I was rear ended! After a few seconds it’ll shift back to 6th gear. I just bought the truck a few months ago. ANY help/suggestions appreciated!
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3rd Gear
Joined: Apr 2024
Posts: 3
Likes: 0
From: Tennessee
Driving steady, no acceleration or deceleration, flat road. No hills, just cruising along and not expecting a shift at all. My wife thought we hit something. It hit that hard! Fluid looks good, no burnt look or smell. Level is good.
Logistics Pro
Joined: Sep 2002
Posts: 4,411
Likes: 1,016
From: Central KY
Any idea if the trans maintenance has ever been done? If the truck is over 60k miles I'd recommend changing the filter with a new Motorcraft filter. Put the Dorman OE pan ($30) that has the drain plug back on in place of the one that doesn't have a drain plug if you need to. Then you can drain and fill the Mercon LV as needed. Takes about 9 quarts of LV to fill back to spec once you change the filter.
Logistics Pro
Joined: Sep 2002
Posts: 4,411
Likes: 1,016
From: Central KY
Yeah I bought mine at 81k. First thing I did was go front to back and do ALL the service. Diffs, t-case, trans, engine oil/filter, fuel filters, the whole nine yards. That way I KNOW what's been done and I can take good care of the truck from here. Did it all myself in the driveway and I've probably got $400 total spent on the entire service front to rear. Only thing left is coolant flush which I will do in October when I install the block heater. Good luck.
Tuned
Joined: May 2010
Posts: 499
Likes: 132
From: Pleasanton, CA
I have the same truck you have. I bought it used as well, had 32k miles when purchased now has 77k. Fortunately mine is shifting fine no issues that you speak of. If no one chimes in with a better solution I would do the a transmission fluid change, as others have suggested. Also a good time to inspect inside the trans also the fluid. I would look closely at the shift solenoids perhaps one is sticking you may see some unusual wear or burnt on fluid?
good luck,
Mike
good luck,
Mike
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