Hi I'm a new F-150 Platinum owner I've had it for about 2 weeks now and I have noticed that when I begin to take off a slight vibration coming from what seems to be the rear of my truck once I hit second gear it goes away and it doesn't do it again until I am decelerating to around 10 miles an hour and below or when I'm accelerating around the same speed. That's the only time it does it. Can anyone please help me out and tell me what this is or could be? It would be greatly appreciated thanks in advance. It's the 5.4 l 4x4

 

Do you have a limited-slip rear diff?

 

I would get under the truck and look at things like U-joints and looking at anything in the driveline for worn parts or issues.

 

Grease the slip yoke.

 

need few more spec on truck, crew cab? long bed? anyhow transmission mount and/or carrier bearing would be my bet

 

I believe it does have one. How can I find out for sure. And what does it ​​​​mean if so?

 

It is the short bed and yes SuperCrew cab. What does the transmission mount look like? And the carrier bearing?

 

google the trans. mount location, and for the carrier bearing if you have a 2 piece driveshaft it's the part that holds it up to the chassis. again you can google both. mine was doing it specially when towing and the tranny mount was shot and good amount of play in carrier bearing and truck had 100k on it

 

Check the drive shaft where the rubber boot is. Mine did the famous bump until I added grease too it. It's a 10 minute job on the first time. Was a post about it recently on here