[mosquitodriver]

I have had a vibrations for the the past 30,000 miles. The vibration is coming from the rear end. The vibrations around 10 mph has a high frequency with a low amplitude. The vibrations between 40-45 mph and above 70 mph feels like wheel hop. I have changed tires, had the tires rebalanced twice, u-joints, carrier bearings, replaced every bushing under the truck, and serviced rear end. Tranny fluid is fine, truck runs great. Does anyone have any idea what the issue could be?

 

[delta99]

Maybe check to see if you have a warped brake rotor/hanging caliper. You could get the drive shafts balanced too

 

[mosquitodriver]

I'll take a look this weekend. Although the vibs are present with the brakes on or off with no change to magnitude. But at this point I will try anything.

 

[mosquitodriver]

Checked brakes yesterday. Right rear brake is frozen. Looks like it is causing most of the vibrations. I will know for sure when I replace it. Probably gonna have to replace the rotor as well.

 

[delta99]

Glad you found it!

 

[mosquitodriver]

Thanks for the help.

 

[mosquitodriver]

Well replaced the brake caliper. It fixed one of the vibrations. But the others still remain. The only thing I have not tried yet is Ford's friction modifier for the differential.

 

[delta99]

Glad part of the issue was solved. I still suspect a drive shaft issue (or as everyone wants to call them, drive line). Try greasing the slip yoke. If vibration still exists after that, take it to a shop and get it balanced

 

[mosquitodriver]

I will try greasing the slip yoke first. Have you already encountered this problem before?

 

[delta99]

I haven't encountered this problem on my super duty, but I have on other vehicles. The slip yokes on the super dutys are common issues, but are usually more of a clunk type of thing. But greasing it is free, so it's worth a try in my opinion. It seems like you have pretty much eliminated everything else. I have seen an unbalanced driveshaft crack open a transfer case, so it may be worth the few bucks to take it to a shop and have the balance checked on it.

 

[mosquitodriver]

I appreciate the help.

 

[delta99]

No problem. I hope you get it figured out

 

[mosquitodriver]

I greased the slip yoke. No improvement. I will be looking for a drive shaft shop and see what they can do.

 

[mosquitodriver]

I am pretty sure I have figured out that my tires are to blame for the vibrations. I lifted the truck slightly off the ground and spun each tire. One part of the tire would glide right over the ground and the opposite side of the tire would scrape. They are BF Goodrich All-Terrain T/A KO. I have read else where that others have had the same vibration problems with these tires.

 

[delta99]

That would do it. You said you had them balanced so I wasn't even thinking tires. I used to run BFGs for a while, but I quit using them because I was only getting like 20,000 miles out of them. Always properly inflated, rotated and I drive like an old lady. They don't last very long, yet they are more expensive than other brands.

 

[mosquitodriver]

I have 25,000 miles on these tires and still have a lot of tread left. The vibrations are just too annoying. What tires are you running?

 

[delta99]

I have hankook currently

 

[aj07]

Did you ever confirm the culprit mosquito driver?

 

[Patriot]

Sometimes the little weights they weld on to balance it fly off and leave you with an unbalanced drive shaft(s).

Edit: out of round tires.

 

[mosquitodriver]

The tires are out of round. I haven't replaced them yet because I want new rims with my new tires and I can't afford them yet. Hopefully later this summer.