hows your rotation record? (tires)
uneven tread wear from inconsistent tire rotation/front end alignment issues can show up this way also. can be very difficult to diagnose. had it show up on my wife's fusion and on one of the fronts on Motorbug. Motorbug's tire was worn out of round so it kind of bounced down the road. still has plenty of good tread... but up front by itself it really makes for quite the carnival ride. the bad wear on the fusion was different... on 2 tires... belts separated internally and crossed over eachother. it was almost invisible... took a really experienced tire guy to even catch it.

moral here is kiss.
got a thump... start at the road... work your way to your butt.

 

Only my wife knows if I have a bumpy butt.

Tires: New. Coasting got rid of the vibration. Speed maintaining and slight-to-moderate climbing or acceleration exposed the vibration. It was much faster than tire rotation (about 3.73 times faster... a clue).

 

i know you already had yours figured out rich... was kinda pointing that at the guy with the thump thump thump under ds floorboard. but ujoint + stuck esof hub could get kinda thumpy to in his situation now that i think of it...

 

What!?! This isn't all about me?

Must have more coffee... I forgot we were helping bad12jr here.

The frequency of the vibration will help to isolate the source... so at least I contributed something in my moment of self-importance.

 

Rich I still would talk to insurance...hit from behind and a bent drive shaft go hand in hand. If anything it will at least put it on record incase something else pops up that was accident related that you may have overlooked

 

Brinelling on the trunnions

 

- Tires have a 1000 miles on them. Balanced with very little weight.
- Ball Joints as one was loose so did them all.
- Wheel bearings fell good.
- Has warn manual lockouts.
- Brakes aren't rubbing, wheels spin free.
- Had a loose TC bolts before and have checked them every 500 or so miles and still tight the last 2000 miles.
- All springs bushings look great.
- New ford track bar.

I really thought it was the tires as they were nitto dura grapplers and getting worn decent. First thought was a belt so I was thinking maybe. Well when I pulled the tires to take to the shop (Had a charging problem at the time) I found the loose ball joint. So new ball joints and alignment. Still there even after all that.

While talking to my buddy the day before this thread he mentioned he had to change his u joints on a ccsb v10 doing the same. I was going to swap wheels thinking a bent one maybe, but that sounded logical.

I have a BTS in it which shifts very firm. I put on traction bars which help tremendously. I would say that is what has worn them as the PO did pull a gooseneck trailer with the truck some.

Appreciate the help and didn't mean to highjack

 

You're not hijacking... you're continuing the quest for root causes of vibration. I'm hearing this is getting common with our age of trucks.

 

Well as soon as I get a day off. And who knows when that'll be ill change them and post some pics. Not complaining by any means but have worked since last Tuesday and am till at least this Tuesday. So time is a little tight for repairs. Hopefully wenesday. Thanks for your the input.