Post Lift Install Vibration

[scubajosh77]

So for background I had the Superlift 2.5" front leveling kit installed with 1.5" Rough Country rear blocks. The install was unintentionally done in phases. First week they did the front lift and the new tires (Cooper AT3 XLT 275R70/18). Drove it home and a couple hundred miles, no issues. Next week they install the rear blocks and now I consistently feel a vibration from take off at low speeds. Like 0-30ish. No felt issues above 30mph. I checked the rear blocks. They appear installed correctly. I checked the U bolt torque, they're in spec. Tires are inflated correctly. I don't imagine that installing the rear blocks would affect the balance of the rear tires, even if they removed them to do the install.

Kinda stumped. I'm super happy with the way the truck looks now but something seems off. Any ideas or suggestions on what the issue might be?

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[Deleted member 9086]

Road force balancing of the wheel and tire combinations.??

 

[hand-filer]

Ignore the advice of post #2. He is wrong with his assessment. The vibration started when the rear lift blocks were added. It's the change in the driveshaft angle that is causing the vibration.
That is the area you need to focus on.

 

[scubajosh77]

Ignore the advise of post #2. He is wrong with his assessment. The vibration started when the rear lift blocks were added. It's the change in the driveshaft angle that is causing the vibration.
That is the area you need to focus on.

Yeah, they balanced the new tires. On the driveshaft angle change, is there anything to be done about it? Anything to worry about it?

 

[CoryB]

There are tapered shims available to correct the driveshaft angle. How many degrees of shim is dependent on the amount of lift and how much it changed the u-joint angles at each end of the driveshaft. The installing shop should be aware of these. If not, find another shop that is.

 

[Deleted member 9086]

You replaced the tires didn’t you.

Numb-nuts would have you start at the most difficult and costly. Which isn’t the way to deal with the issue Otherwise, he doesn’t know but is making a guess.

So much for nimrod thinking……………..??

 

[scubajosh77]

You replaced the tires didn’t you.

Numb-nuts would have you start at the most difficult and costly. Which isn’t the way to deal with the issue Otherwise, he doesn’t know but is making a guess.

So much for nimrod thinking……………..??

Yes. And they were balanced when installed.

 

[scubajosh77]

There are tapered shims available to correct the driveshaft angle. How many degrees of shim is dependent on the amount of lift and how much it changed the u-joint angles at each end of the driveshaft. The installing shop should be aware of these. If not, find another shop that is.

And the risk of damage or premature wear if I don’t do anything?

 

[embedded rock]

Tapered shims are needed to correct this new vibration. Most likely will need 2-4 degree shim.

Without this correction, the rear shaft u-joint(s) are working over-time.

 

[Deleted member 9086]

Yes. And they were balanced when installed.

Road force balancing is different from spin balancing. It matches the wheel and tire point of balance.

https://tireforge.com/what-is-road-force-balancing/

If it was the drive shaft angle, you’d have the vibration at any speed yours is disappearing at 30+ mph..

If it’s a drive shaft angle issue, you’re going to cause premature wear of the U-Joints and bearing along with other driveline component accelerated wear.

Easiest thing to do first is; ask the installer if they aligned the driveshaft with the appropriate shims. Don’t go off half-cocked with an assumption they didn’t.??

 

[scubajosh77]

Road force balancing is different from spin balancing. It matches the wheel and tire point of balance.

https://tireforge.com/what-is-road-force-balancing/

If it was the drive shaft angle, you’d have the vibration at any speed.

If it’s a drive shaft angle issue, you’re going to cause premature wear of the U-Joints and bearing along with other driveline component accelerated wear.

Easiest thing to do first is ask the installer if they aligned the driveshaft with the appropriate shims. Don’t go off half cocked with an assumption they didn’t.??

No assumption. If there were shims I'd see them. No shims here

 

[Deleted member 9086]

No assumption. If there were shims I'd see them. No shims here

Bottomline, these are suggests as to what the possible issue is. No one here has any idea what your installer has done or needs to do. It’s your truck and you need to do what you think is right.

I’d talk to the installer first before attempting to correct a possible issue. They’re the only ones familiar with your install.??

 

[scubajosh77]

Bottomline, these are suggests as to what the possible issue is. No one here has any idea what your installer has done or needs to do. It’s your truck and you need to do what you think is right.

I’d talk to the installer first before attempting to correct a possible issue. They’re the only ones familiar with your install.??

Perfectly reasonable

 

[TwoTone]

You replaced the tires didn’t you.

Numb-nuts would have you start at the most difficult and costly. Which isn’t the way to deal with the issue Otherwise, he doesn’t know but is making a guess.

So much for nimrod thinking……………..??

Before you call people names, you should make sure you comprehend what you read.
Let's see if we can help you.
Tires and front leveling done first at same time. No vibration.
Later the blocks installed- vibration appears.

Please enlighten all the numb-nuts out there how rear blocks affect balance.

 

[hand-filer]

Before you call people names, you should make sure you comprehend what you read.
Let's see if we can help you.
Tires and front leveling done first at same time. No vibration.
Later the blocks installed- vibration appears.

Please enlighten all the numb-nuts out there how rear blocks affect balance.

You're about to be included in the banned by Ranger/Hobbit club. Many members in the club.

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