Rear Vibration, TSB & Dealer

[TampaDieselFX4]

Well I took my truck to the dealer b/c I have "THE" rear vibration around 45-48mph. I've checked my driveling angles, road force balanced tires and had 3 sets of different tires (2 AT/S's and 1 procomp), stock height, 4" lift... back to stock and the vibe is still there throughout all of that. Then I found out about the TSB that addresses this issue. So I took it in, told them I have a vibe in the 45-48 range from the rear. Next day they call me saying My tires are bad. which are the new AT/S's that were installed & Force balanced at a different ford dealer 500 miles/2 months ago after I dropped my lift and went back to stock. I gave him the TSB# and he said they'd look into it. I called back few hrs later... they're doing the TSB. WTF, I gotta give the service center TSB #'s?? They didn't bother to see if there was a TSB for this ever so common problem? Still haven't picked it up yet... so we'll see.

 

[TampaDieselFX4]

Picked it up today. They did do the TSB. It's a HUGE vibration mount that bolts to the side of the LR hitch. Looks like the guy did a clean install on it, even painted the bolts. the alignment dimple is centered too. It cut the vibes down I'd say 50%, deff worth having it done. Really stupid looking part, but it works. In the end the dealer worked out with no issues and I'm happy. But now he put the monkey in my head about bad tires... but the truck drives smooth as silky at every other speed. Oh well. I'm happy now and it's pretty much fixed.

 

[95_stroker]

What is the TSB# and would you mind snapping a few shots of the balancer they installed?

 

[TampaDieselFX4]

I will have pics and TSB # posted this evening. Like I said... really big stupid looking part but Obviously Ford's engineers think it's good. It's only held on with 3 bolts to the hitch... so I could easily take it off, and put i back on for comparison. but it's working for now.

 

[powerboatr]

mike heres the pics of mine
Tsb 07-5-11 Vibration/hop At 40-48 Mph - (8.0 Hz) - Trailer Hitch Equipped Vehicles Only

ISSUE:

Some 2005-2007 F-Super Duty vehicles with a long wheelbase of 156", 158", or 172" (396, 401, or 437 cm) and equipped with a trailer hitch may exhibit a vehicle vertical vibration, often described as "hopping", on smooth or coarse road surfaces in the 42-48 MPH (68-77 Km/h) speed range. Although this behavior is considered normal for an over 8500 GVW truck, some customers may be sensitive to the concern.
ACTION:

To improve the 42-48 MPH (68-77 Km/h) vertical vibration, follow the instruction sheet included in the Damper Service Kit.

NOTE: THE INSTALLATION OF THIS DAMPER WILL NOT IMPROVE RIDE ON SEGMENTED CONCRETE HIGHWAYS, STEERING WHEEL VIBRATION/SHIMMY, OR GENERAL HARSH RIDE CONCERNS.


PART NUMBER PART NAME
5C3Z-5D008-A Damper Service Kit
WARRANTY STATUS:

Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.
OPERATION DESCRIPTION TIME
070511A 2005-2007 F-Super Duty With Trailer Hitch: Install The Damper Service Kit. 0.6 Hr.

 

[TampaDieselFX4]

POWERBOATR- Did they mount yours to the side of the Hitch? on the LR? That's what it looks like, but I can't tell for 100%. that thing has to weight o over 20#'s...

 

[powerboatr]

POWERBOATR- Did they mount yours to the side of the Hitch? on the LR? That's what it looks like, but I can't tell for 100%. that thing has to weight o over 20#'s...

yup it bolts right to the big web on the 15 k hitch, thats why you have t have the factory hitch installed to be in compliance i think... drivers side. weight??? i bet its 20-23 lbs, its a hunk a hunk a burning rubber lord mount


"behavior is considered normal for an over 8500 GVW truck, some customers may be sensitive to the concern" i told em i was sensitive to this concern

 

[TampaDieselFX4]

Ok, mine is done correct than... on the driver side of the hitch web. They told me tires bad, I gave them TSB # and said I want that done. Done. It's just a big counter weight to absorb some vibes back there... oh well it works. This weekend I'm going to go over my driveline angles again, and do some tire pressre/wear patterns and be done with it.

 

[powerboatr]

i found tire pressure has a big effect
when i am empty i run 35-40psi out back on the duals, makes a world of differnce
up front 60-70 depending on load


i try to change em around to get good flat across the tread wear, so far so good

 

[TampaDieselFX4]

Yeah the tires say max 80psi, and ford is saying 65 all around. I bet if you do a wear pattern 70ish is better upfront... I'll be doing wear patterns this weekend.