Johnnyh55

I have a noise that I am pretty sure is coming from the left rear suspension. It happens sometimes when I hit a pothole or backing up from my driveway as the suspension flexes when getting of the apron. It even happened sometimes while turning at an intersection at speed 18-30mph. It's intermittent, I took it to the dealer twice but they could not replicate it even with chassis ears and they said that the shop foreman would go with me on a test drive to hear the noise but I haven't found a place near the dealer where I could replicate the noise every time.

I have an AS 1.5" level in the front but all stock in the back. I am running a 275/65/20 Goodyear duratracs. I thought maybe the the leaf spring shackle bolt could of been loose when I installed the mounting hangers for my dual exhaust in the rear so I tighten the bolt with a breaker bar and went for a test drive and it still made the noise. I don't know what to check everything looks ok from underneath. I tried to shake the truck from side to side while it is parked on level ground and it doesn't make the noise. I tried jumping around in the bed and it doesn't make the noise. I tried to backup the rear left wheel on a ramp to flex the suspension and jumped in the bed and wiggle from side to side and it didn't make the noise. I don't know what to try next, could the noise be coming from the 2 piece drive shaft? It doesn't sound like a driveshaft noise. The only thing I haven't tried yet is to jack up the truck and leave the wheel hanging in the air and maybe check if the leafsprings are loose that way? I attached some pictures but to me, everything looks normal.

SGFXDeuce

iTrader: (1)

Mine does the same when backing out of my driveway. Haven't had a chance to get under it and check it out.

Johnnyh55

I noticed that the noise also happens when the front wheels pull up into an entrance, I am not sure if it's the rear suspension flexing causing the noise or the noise is actually coming from the front. It's so hard to tell. I think I will remove my auto spring 1.5" leveling kit to see if it's loose. The only thing I can think of when I installed it 2 years ago, was that there was no way for me to tighten the strut bolts really tight since the way the auto spring is designed you can't fit a socket on the strut bolts, you can only use an open ended wrench as you can see in the pic below. If I would of had a crow foot I get guess I could of torque it with a torque wrench but I didn't have one. At the time, I also didn't think of holding the top of the strut with a pry bar between the bolts while tightening the leveling kit bolts. It just sucks because I will need another alignment once I put it together even if that wasn't the problem but it's the only way to find out I guess.

Johnnyh55

So i just got around to removing both struts to tighten the leveling kit bolts. I was able to tighten the bolts some using a prybar and I put it all back together and went for a drive. The noise is still there. I am almost certain it's coming from the rear. I don't know what to do next, take apart the rear brakes to verify them?

Spiky

Try lubing the gate

Johnnyh55

Lubing the tailgate? At the hinges?

MN JIM

Same problem here. Sometimes the noise sound like it's coming from the front, other times from the rear. Made a video of the noise before I took it into the dealer. They said they have no clue. Everything is stock on my 2014.

Spiky

There have been a couple threads here where that turned out to be the noise. Seems impossible....

TimelessR1

this might be the issue..

https://www.f150forum.com/f38/what-part-28799/

Ecoboostin

This may sound stupid. But I heard an awful noise coming from the rear end as well. Only happens every so often, bumps and turns. I came to the conclusion it was my hitch receiver. Try shaking it and see if it replicates the same noise.