Vibration at 80mph

[Mishal]

Hey guys
I recently replaced my shocks with new AC Delco shocks and have new tires and aligned together with Rod alignment and new steering shaft.
When I driver above 60 upto 80 I get too much vibration in the car where you feel the dashboard is shaking uncomfortably. Any suggestions will be appreciated thanks

 

[rmaker]

I bought a 2011 Suburban back in April. It had a horrendous shake at highway speeds, steering wheel shook. Turned out it was a bent drive shaft . Did u have the tires road force balanced?

 

[OR VietVet]

Are you sure there are no bent wheels? What tread design are the tires?

 

[Hoesgottaeat2]

Was it shaking like this before the work you mentioned was done? If not, I'd be looking at a wheel balance issue to start. Vibration only at certain speeds is typically indicative of the need for wheels to balanced.

 

[thegrunter]

A lot of balancers are set to freeway speeds like 55-65. 80 mph might be an indication the balance at 60 wasn't spot-on.

 

[Mishal]

I bought a 2011 Suburban back in April. It had a horrendous shake at highway speeds, steering wheel shook. Turned out it was a bent drive shaft . Did u have the tires road force balanced?

Thank for the comment. Yes I balanced it

 

[Mishal]

Are you sure there are no bent wheels? What tread design are the tires?

The wheels went into full refurbishment with diamond cut and no bent what do ever. It has Geo lander tires but the oem size.

 

[Mishal]

Was it shaking like this before the work you mentioned was done? If not, I'd be looking at a wheel balance issue to start. Vibration only at certain speeds is typically indicative of the need for wheels to balanced.

Yes it was shaking like this and I thought by replacing the shocks and arms and ball joints the problem will disappear but still there.

 

[Mishal]

A lot of balancers are set to freeway speeds like 55-65. 80 mph might be an indication the balance at 60 wasn't spot-on.

Will check it out again. Thanks

 

[OR VietVet]

Yes it was shaking like this and I thought by replacing the shocks and arms and ball joints the problem will disappear but still there.

Knowing all this, from the beginning, would be a big help. Please, in the future, with any vehicle problems, it is best to share ALL info of before and after.

 

[Hoesgottaeat2]

How about the sway bar? That still there? Links? If those are good, I'd be looking at other rotational items i.e. drive shaft, u-joints, etc...

 

[Mishal]

How about the sway bar? That still there? Links? If those are good, I'd be looking at other rotational items i.e. drive shaft, u-joints, etc...

I didn’t change the sway bar
Let me look into it. Thank

 

[FA31]

I didn’t change the sway bar
Let me look into it. Thank

Any update?

You look at u-joints, bushing in transfer case extension housing, rear axle bearings, body mounts?

 

[B-train]

I had an issue with my 2017 yukon at highway speeds - around 80 mph. I could feel it in my butt. Tires were new and balanced. I pulled the rear driveshaft down and found the axle end u-joint was stiff to move by hand. No corrosion could be seen.

I replaced it and all was good. After I pulled the OEM apart, the bearings were getting dry and rusty. Easy thing to check/fix.

 

[OR VietVet]

I had an issue with my 2017 yukon at highway speeds - around 80 mph. I could feel it in my butt. Tires were new and balanced. I pulled the rear driveshaft down and found the axle end u-joint was stiff to move by hand. No corrosion could be seen.

I replaced it and all was good. After I pulled the OEM apart, the bearings were getting dry and rusty. Easy thing to check/fix.

Been there and done that with u-joints.