Afternoon everyone,

So just recently I was rear ended (small amount of damage) it was all cosmetic and on the passenger side rear. The truck was at the shop for about 3 weeks. Now that I have it back all is fine and well with the body but now I'm hearing a noise at specific RPM and MPH and GEAR.

I mentioned the damage just so there's more info. But I noticed in 6th gear @ 1200-1500 RPM and 50-60mph there seems to be a harmonic vibration or noise coming through the floor boards. If you are at 60MPH and let off the throttle it sounds like a bad bearing. Another strange thing that happened is while backing up (very slowly) there's a loud squeak or rubber against rubber noise coming from the driveline. I went underneath while my wife backed up and I can not pin point exactly where but i know its transmitting through the driveshaft. (side note: my local deal replaced the rear end pinion as well as the seal, that's a story in it self) but I did not hear or feel anything after that and that was back in January / February of this year)

Just curious if anyone else was having a similar noise while driving or a noise in the drive shaft while backing up. The truck is a 2017 F-250 SB CC sitting on 35s and fully deleted with 97,242 miles

Thanks,
AJ

 

Driveshaft carrier bearing....?

 

From looking underneath the DS has ujoint at the trans to the shaft to a ujoint at the pumpkin. no carriers

 

If it wasn't there before the wreck, then take it back to the shop that repaired it and get them to fix it and get a supplement to the insurance claim.

 

You are correct but the strange part for me is since the truck was still able to be driven, I was using it before the body company had an opening and the noise wasn't there. Some would say the body company might have done something, Ive dealt with this place for a couple of times and they are extremely professional and I have not had any problems with them screwing up something and trying to cover it up. and they would have no reason to mess with any part of the driveline.

 

And, a shop like that would be the first one to jump right on getting it fixed because something they did, or didn't do, caused an issue with your truck.

 

Pictures of the damage from the accident? More detail of what was hit in the accident.

Could be frame, suspension, drive train tweaked. Odd tire wear from between accident and repair? or damage to a drive line component in that time frame? Gremlins?

 

The side panel, bumper, and tail light had to be replaced

 

I'd check the exhaust and see if it's bent or fallen off a hanger or a hanger was damaged. check for loose hardware, clips in the rear or anywhere the body shop would have touched to make the repairs. Have the tires been rotated recently?

The impact looks like it came from the rear not the side. Doesn't look like the tire or axle would have been hit. like you said it looks pretty minor. I doubt it's from the impact but could be from the repair. If this incorrect let us know.

 

The exhaust is on all of its hangers, not loose at all, not rubbing (thought maybe it was rubbing on the tire but its no where near it) nothing seems loose, the noise in reverse is only in reverse and when you go very slow. I have no rotated the tires recently and they are in the same location as they were when i dropped it off.

The guy was trying to go around me in traffic, we were in the middle lane and he tried to go into the right and didn't realize how close he was to me. I want to bring it to Ford first to see if they can hear anything and maybe if they come back and say its XYZ and that was part of the repairs i will bring it back to the body shop. I trust the body shop with body work, and my dealer for everything else. I have a very good relationship with the dealership and they know the truck top to bottom. Since this is ticking me off I will have my wife back up while i listen again. Im also tempted to remove the DS and check the ujoints.

 

Jack it up and check the wheel bearing, u-joints, etc. Check to make sure the 4wd hubs are in auto and not locked. Guessing that this point. Maybe the slip joint on the DS is shot. Can't think of anything that would be a bad bearing sound and a rubber on rubber. Even more of stretch, any chance the pumpkin rotated on the axle tubes? Or axle u-bolts stretched or broken. Figured your delete may also have some performance mods that may have over worked something. Look for worn out bushing and mounts

 

That's next on the list to check in the front end. checked the hubs yesterday because i thought maybe someone flipped it at the body shop or something.

Slip joint on the DS?? my DS is a hollow aluminum tube that has a ujoint at the trans and the pumpkin. Or do you mean the slip into the trans? I know my 01 had a slip joint but the 17 does not (within the DS span)

I will check the axle tube to see if i can see any marks near the tube to see if it shifted, it still drives straight doesn't look like its doglegging. The delete is tuned but I do not use any extra HP, i keep it on a stock setting but the truck just recognizes that the systems are not there.

Anyone know the torque spec of the DS bolts that hold it to the flange? i may remove it to check the joints.

 

tossing this out there
but did you look at the bed mount bolts, might be loose and letting some vibrations transmit through.

 

UPDATE......

So after doing a little more research I found that the u joints on the drive shaft needed to be replaced. My guy at my local dealership wasn't sure at the time if the u joints would be covered under the powertrain warranty so I figured, I've done u joints before so why cant i do these. Let me tell you, I will NEVER do them again on this truck!! For starters I am familiar with my older truck which had solid steel shafts and yokes, not an aluminum shaft and aluminum yokes. My guess is that a dealer would replace the whole drive shaft without replacing the u joints unless the truck has zero miles and never saw salt. The aluminum yokes and steel clips do not mix, the groove had a ton of corrosion, and to get them out was a pain. Now there's no safe way (that I could see) of removing the u joint without destroying the yoke. Cant hit it, cant press it (one slip and now the yoke is messed up, which happened) I finally got them replaced but it was an absolute pain to do. I have 16+ years working on diesels in a shop and this was the most stressful job I have ever done haha especially when I do not want to buy a new shaft.

If anyone has any tips that I missed to make it easier next time I have to do them, please let me know.

 

Use a plastic gallon milk jug with the top cut off, Fill it with enough Veg oil and stand the driveshaft on end soaking the joint overnight.
The oil will loosen the rust and assist in removing the u joint.