06 4wd Diesel bouncing help
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Senior User
Joined: Aug 2006
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Got the call today and truck is not ready. Regional Ford Rep told them that back two new tires are bad as well. They have ordered two tires and for me to come get my truck until the tires arrive. So they replaced all four tires, then two more on friday and now two more are on order. 1500 miles on my truck. Lets see if this will fix the problem.
Mountain Pass
Joined: Sep 2006
Posts: 228
Likes: 2
From: Memphis TN
mines at the shop now,brand new F350 and it rides like crap...
front end is bouncy.front end shimmeys....I made a switch from chevy to ford
and so far I am unimpressed - unfortunatly Dmax's were all sold out by me
so I settled and now I am pissed
front end is bouncy.front end shimmeys....I made a switch from chevy to ford
and so far I am unimpressed - unfortunatly Dmax's were all sold out by me
so I settled and now I am pissed
New User
Joined: Aug 2006
Posts: 22
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From: Gardnerville, NV
Just had mine in for the second time yesterday. Got it back and still the same issue: font end bounces at 42 MPH and now it shimmys at 65! WTF? And it even has the death wobble too! This is the second time the dealer has done a road force balance and they said "it checked out OK".
I'm starting to think this is not entirely a tire issue. It just seems like there is a chassis resonance that sets up at some particular speed. I dunno. Off to the dealer again tomorrow...
I'm starting to think this is not entirely a tire issue. It just seems like there is a chassis resonance that sets up at some particular speed. I dunno. Off to the dealer again tomorrow...
Postmaster
Joined: Jun 2004
Posts: 2,646
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From: Milky Way Galaxy
Originally Posted by Sonofthedesert
just got back from mexicali mexico yesterday. About 200 miles one way home to Chino, Ca. I had the tires rebalanced be-4 I left on Tues the 12th of sept. Although the place told me the right sides were out .75 If I remember correctly- there was some improvement but again, on flat asphalt, - no extreme bounce but certain sections, closely grouped slabs of cement - bout shook my kidneys into my brain. I'll definitely keep an eye on this thread to see if there is more to this problem than meets the eye. It would seem that a vehicle this big with such a stiff suspension is going to have some bounce to it but I dont know if you would agree with me on that. The bounce just seems like a little too much
Senior User
Joined: May 2004
Posts: 141
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From: southwestern us
Finally, someone got this thread going! I have an 04 PSD Crew Cab Long Bed 4WD that has done this since I bought it. I have tried to get a response on this thread at least 5 times in the last year and no one responds. I was starting to think I was the only one. I put a Donahoe 3 inch leveling kit on the front, 2 inch blocks in the back and 295-75R-16 Terra Grapplers on steel wheels with Super Duty-specific valved Bilsteins and nothing changed. It begins its bouncing routine at exactly 41 mph and smoothes out at exactly 43 mph with the bed empty. It will not do it at that speed with one or two motorcycles in the back nor with a trailer hitched to it, although I suspect it will do it at some other speed that I have not found yet. I do not believe it is tire-balance related. I have had the tires static-balanced and road-force balanced to no avail. I fully believe it is something to do with harmonics and it drives me nuts, though it is fun to watch the wife in the passenger seat between 41 and 43 mph. I digress, my only alternative at this point is to get from 40 to 44mph as quickly as possible to avoid the annoyance. I also think it is getting slightly worse as the truck gets more miles on it.
New User
Joined: Aug 2006
Posts: 22
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From: Gardnerville, NV
EnviroCon, I believe the issue at hand has to do with the mysterious 42 MPH front end bounce rather than the annoying freeway rear end hop. I have that as well and thanks for the info. But, like dmgiff, the bounce (I like watching my wife in the passenger seat too!) happens, at least for me, on perfectly smooth roads. Just get up to 41-43 MPH, set the cruise, and bounce away. I can reporoduce it every time and have for the dealer as well. They don't have a clue as to what to do next.
I'm waiting for a call back from the western region Ford rep and will report back any resolution.
I'm waiting for a call back from the western region Ford rep and will report back any resolution.
Postmaster
Joined: Jun 2004
Posts: 2,646
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From: Milky Way Galaxy
Originally Posted by Sonofthedesert
Anyway as to the bouncing, I noticed it around the 68 mph to 75 mph threshold. As I went over 75mph it was definitely less pronounced, like around the 80-84 mph threshold; I did notice that the road condition visually played some role as out here in Cali- some of the concrete freeways are poured sections of concrete closely spaced and on these areas of the road the bounce was tremendous, however on long streches of smooth asphalt, the bounce would disappear.
Last edited by EnviroCon; Sep 19, 2006 at 05:06 PM.
New User
Joined: Sep 2006
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As Yogi said ....Deja vue all over again..
I just posted on another site the fact that my 06PSDcc 4x4 (20" wranglers) has been at the dealer since Tuesday (now its friday afternoon, prob. get it back on Tues) get'en the tire shimmy fixed (attempt #2). The first go around they replaced the two left side tires (?). Now they say that all four fail the force balancing trick. But I have a trick of my own up my sleeve, I got four brand spank'en new centermatic balancers sit'en in the o garage to slap on. A buddy with a 05Harley PSD 4x4 witht he same tire solved his (same) problem) with a on truck high speed balance. This is after the TSB 052624 did not fix the problem....
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Freshman User
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The new shocks all the way around have fixed 80% of the problem - the rest of it is just "stiff" one ton suspension -- and bad U.S. roads - we'd rather send our tax dollars overseas than fix our crumbling infrastructure....but that's a whole different problem.
For now - I'm satisfied -- the OEM Rancho shocks were junk from the get go -- and the ride is far superior now. It at least "settles down" after hitting a bump etc in the road -- where before it was jello jigglers!
For now - I'm satisfied -- the OEM Rancho shocks were junk from the get go -- and the ride is far superior now. It at least "settles down" after hitting a bump etc in the road -- where before it was jello jigglers!
Cargo Master
Joined: Nov 2004
Posts: 2,858
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From: Friendswood, Texas
Originally Posted by GregWeld
The new shocks all the way around have fixed 80% of the problem - the rest of it is just "stiff" one ton suspension -- and bad U.S. roads - we'd rather send our tax dollars overseas than fix our crumbling infrastructure....but that's a whole different problem.
For now - I'm satisfied -- the OEM Rancho shocks were junk from the get go -- and the ride is far superior now. It at least "settles down" after hitting a bump etc in the road -- where before it was jello jigglers!
For now - I'm satisfied -- the OEM Rancho shocks were junk from the get go -- and the ride is far superior now. It at least "settles down" after hitting a bump etc in the road -- where before it was jello jigglers!
I really think that if replacing shocks fixed 80% of the problem, all that happened is the shocks helped address a symptom of the problem and the problem (cause) still exists. This has to be a tire, rim, or driveshaft issue. Are folks having this problem with aftermarket rims or is this only a problem with the stock rims? Is this a problem with all styles of stock rims or only one?
Freshman User
Joined: Jun 2006
Posts: 25
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I have stock "cast" wheels and BF Goodrich tires (OEM) -- and I take back the 80% comment - I went over the highway yesterday and it bucks like a mean mule -- just like before -- so the Shocks didn't help. It might have dampened the problem a wee bit --- and it does settle down faster - on just normal roads - so the shocks were part of the problem -- but I agee - there is a design flaw here - spring rates not right - or geometery or something. I will repeat - this is NOT a tire balance issue - and it's not driveshaft vibration ======= those are completely different problems and not what I'm experiencing. She's smooth as glass on a smooth highway.... but let you get on some concrete and it starts porpoising (that's a term used in the marine/boat industry - when you don't have the boat trimmed properly - she'll bounce up and down in the bow).
This is a lift the front - then the back - until the whole darn truck is flopping up and down 2 or 3 inches --- so the suspension is failing to soak up the bumps and is transfering it to the whole truck!
This is a lift the front - then the back - until the whole darn truck is flopping up and down 2 or 3 inches --- so the suspension is failing to soak up the bumps and is transfering it to the whole truck!
New User
Joined: Aug 2006
Posts: 22
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From: Gardnerville, NV
GregWeld,
In addition to my "42MPH" bounce problem, I also get "porposing", especially on jointed concrete freeways. It's quite bad, literally clacking my teeth together! I find that it is much less pronounced at certain speeds but I agree that it is something inherently wrong in the chassis/suspension dynamics.
I think shocks with more rebound damping would help but there is only so much that can be done with the ultra-stiff spring rates these trucks have. I may try and remove a few leafs in the rear just to see if it makes any difference. My BIL did this on his '03. In fact, he removed the overload and upper leaf, then put on air bags. His rides much better than mine on concrete freeways.
In addition to my "42MPH" bounce problem, I also get "porposing", especially on jointed concrete freeways. It's quite bad, literally clacking my teeth together! I find that it is much less pronounced at certain speeds but I agree that it is something inherently wrong in the chassis/suspension dynamics.
I think shocks with more rebound damping would help but there is only so much that can be done with the ultra-stiff spring rates these trucks have. I may try and remove a few leafs in the rear just to see if it makes any difference. My BIL did this on his '03. In fact, he removed the overload and upper leaf, then put on air bags. His rides much better than mine on concrete freeways.
Junior User
Joined: Jun 2003
Posts: 69
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From: Oregon
I also have the 42mph shake. I have an 06 F350 PS 4x4 LB CC with the fancy 18" aluminum wheels. I had the shake with the factory Conti's. They replaced them with ProComp ExtremeAT's 33x12.5. I still have the shake. They dynamically balanced them on very high quality balancers and added weight to both inside and outside of the rims. I really don't think it is a tire issue.
I travel to work on a very nice road that has just been resurfaced. It is smooth as glass (I know I rode my bicycle on it) and I get the shake there every time. So it is not the road. I drove it the other day with some tractor implements in the back and I can't remember if it shook but that might indicate that it didn't.
I travel to work on a very nice road that has just been resurfaced. It is smooth as glass (I know I rode my bicycle on it) and I get the shake there every time. So it is not the road. I drove it the other day with some tractor implements in the back and I can't remember if it shook but that might indicate that it didn't.
New User
Joined: Sep 2006
Posts: 11
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From: Chino,Ca.
As a tile contractor, there isn't much that goes into the bed of my ford that doesn't have a significant amount of weight. Here is what I'm finding out that seems to help my ride a lil. When I'm freeway bound, particularly, known bouncy sections, I've found reducing my speed to below 70 mph, like 63-68 seems to get rif of the gnarly bounce, but again, thats with stuff in the bed of my truck. My .02 cents worth. Keep the thread alive.