Rear end hopping
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Junior User
Joined: Feb 2004
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From: Rosedale
Rear end hopping
I have expierenced this hopping situation before but was wondering if anyone knows what the deal is. It seems like every time I put on the brakes, the rearend of the truck wants to hop up and down, not much, something about equal to a tire out of balance. It seems like every truck that I have had does this. Does it have something to do with both shocks being on the backside of the axel? Is there anything that I can do about it?
2004 F250 FX4 Crew Cab
V10 Automatic
3.5" Springhanger in front
3.5" Block in back
Adjustable Trac Bar
Fabtech single shocks @ all 4
305/70/16 BFG MT's
Stock Rims
2004 F250 FX4 Crew Cab
V10 Automatic
3.5" Springhanger in front
3.5" Block in back
Adjustable Trac Bar
Fabtech single shocks @ all 4
305/70/16 BFG MT's
Stock Rims
Postmaster
Joined: Jan 2005
Posts: 2,753
Likes: 3
From: Phenix City, AL
Sounds to me like more of a brake rotor issue than a shock issue. If it was doing it on acceleration, I would say you have the SD axle wrap issue that is common to these trucks when big blocks are used. But because you say it is under braking, I would be more inclined to take a look at the rotors for warpage, cracking, or just not being properly seated.
Postmaster
Joined: Jan 2005
Posts: 2,753
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From: Phenix City, AL
I'd be less likely to think so on drum brakes, but it is possible. Driveline vibrations are a pain in the butt to diagnose.
One thing you can do is jack up the back of the truck, both sides. Make sure the front wheels are well blocked. Start the truck up and get the tires spinning to the speeds you normally would and apply the brakes and see if the vibration is there. If it is, take the wheels off and do the same. Have a buddy look to see if he can tell where the vibration is occuring. It could also be farther up the drive line, such as a u-joint out of whack or the DS being out of balance.
Sorry, I just thought of this too. Is it vibrating or does it feel like the brakes are pulsating. Can you veel the vibration in the peddle or through the steering / whole truck? And, do you KNOW it's coming from the back?
The only other thing I can think of, before bringing it in to get looked at, is drop down to the brake forum and ask there too. Like I said, vibration is a pain to diagnose without narrowing things down.
One thing you can do is jack up the back of the truck, both sides. Make sure the front wheels are well blocked. Start the truck up and get the tires spinning to the speeds you normally would and apply the brakes and see if the vibration is there. If it is, take the wheels off and do the same. Have a buddy look to see if he can tell where the vibration is occuring. It could also be farther up the drive line, such as a u-joint out of whack or the DS being out of balance.
Sorry, I just thought of this too. Is it vibrating or does it feel like the brakes are pulsating. Can you veel the vibration in the peddle or through the steering / whole truck? And, do you KNOW it's coming from the back?
The only other thing I can think of, before bringing it in to get looked at, is drop down to the brake forum and ask there too. Like I said, vibration is a pain to diagnose without narrowing things down.
Posting Guru
Joined: Mar 2005
Posts: 2,060
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From: Burnsville, MN
Well, I've certainly experienced it, but for me its related to the type of road and my own driving style than anything else. There's one downhill intersection in particular where this will always happend if I hit the brakes too hard. For me I think its just so-called "axle wrap" due to the fact that my rear axle is rated for 9,000 pounds but its probably only carrying one!
I would think an easy way to determine whether the problem is your brakes is to put a thousand pounds in it. My bet is that your brakes are just fine.
I would think an easy way to determine whether the problem is your brakes is to put a thousand pounds in it. My bet is that your brakes are just fine.
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Junior User
Joined: Feb 2004
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From: Rosedale
Call me silly but what are you referring to when you say axle threads, are you referring too the lug studs?
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I get a similar vibration in my 2005 stx stepside shortbed. If I am braking when I run over a rough surface, the rear end hops so much it feels like the rear is coming around. Complained to the dealer who's opinion was tire issues. Tire issues at 3000 miles and stock tires? Continues to this day at 8500 miles.
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From: PA
Originally Posted by wpeck
I get a similar vibration in my 2005 stx stepside shortbed. If I am braking when I run over a rough surface, the rear end hops so much it feels like the rear is coming around. Complained to the dealer who's opinion was tire issues. Tire issues at 3000 miles and stock tires? Continues to this day at 8500 miles.
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