I have a 17 Super Crew 4x4 6.5' bed with about 5K miles.

The truck drives great and very smooth. However, I've put it in 4A while driving straight and it gets a slight vibration. I would expect that in 4H mode....but not 4A.

Is that something I should have checked out, or do all of them exhibit some vibration in 4A mode? It's more noticeable when acceleration from a stop. If I switch back to 2H it becomes smooth again.

Thoughts? Ideas? Normal or it's gonna blow up?

 

I have a 2016 2.7 and I don't get any vibration like you are describing in 4A.

I would check with the dealer. Expect an answer like "They all do that". And your response will be, "Show me. Let's drive a couple that are sitting on the lot waiting to be sold".

 

issue with the front drive shaft.

 

2016 Platinum 3.5 EB 6.5 bed. 8900 miles (weekend driver). When in 4A, vibration is on acceleration between 3-4-5 gears only when engine is at 2000 -2100 RPM. Dealer verified and believes it's from transfer case but the transfer case was checked and is OK. They wrote it up as a concern with no immediate cause/solution. Essentially a watchful waiting scenario right now.

 

I'll try to get it to the dealership in the next month.

I mostly feel it through my feet on the floorboard, which seems odd. You definitely know it's in 4WD....but I don't think you should be able to feel anything in 4A.

 

i think 4a activates the front shaft so if there is a problem in the u-joints or with the shaft you would feel it in 4a.

also do any of the posters know if you removed/disconnected your front drive shafts from either the diff. or transfer case ? i

 

If then what?

 

I think I've read on here somewhere about some shafts or u-joints not being properly greased by Ford when new.

And, as Brand asked....you didn't finish your question.