but just the 1/2 shaft U joints would be my first guess/check.
Bad Vibration at 65 mph
Thread Starter
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Joined: May 2010
Posts: 60
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Bad Vibration at 65 mph
Hello,
like the titles says "Bad Vibration " when I get to 65 mph..
The year is a 84 with 98k miles.. just had front end alginment done after I had the power steering rack put on ..
Not sure if this was happeing before that work or not , Because I couldn't drive the car till I had the work done..
Car does have the Z-51 suspension on it (not sure if ya need to know that)
The guy doing the work said the shocks looked newer (just old , car sat for 7 years)
like the titles says "Bad Vibration " when I get to 65 mph..
The year is a 84 with 98k miles.. just had front end alginment done after I had the power steering rack put on ..
Not sure if this was happeing before that work or not , Because I couldn't drive the car till I had the work done..
Car does have the Z-51 suspension on it (not sure if ya need to know that)
The guy doing the work said the shocks looked newer (just old , car sat for 7 years)
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Are you sure they arent good vibrations? 
Just kiddn... Does your steering wheel shake? Can you tell if its coming from the front or back?
Just kiddn... Does your steering wheel shake? Can you tell if its coming from the front or back?
Last edited by dogfish246; Aug 3, 2010 at 01:21 AM.
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
I agree with Badduck, vibration at that speed usually is tires/wheels. Try swapping wheels front to rear to see if the vibration changes, not necessarily goes away. If it does change, try balancing the wheels at a competent shop that uses high-speed balancing. These rims are so wide that inner/outer balance is important. Also possible- an out-of-round or delaminating tire, which you can sometimes spot by spinning the wheel by hand while off the ground, holding a piece of chalk on a firm support almost touching the tread so it marks the high spot.
Burning Brakes
Joined: Oct 2009
Posts: 773
Likes: 2
From: Minneapolis MN
Flat spotted tires from sitting for awhile
Check u-joints like previously stated.If shaking is in steering wheel that is something in front end(suspension).But still have a through inspection done on suspension & bringing car to a quality tire shop with a road force tire balancer is the option for checking for bent wheel,flat spotted tire,or bad tire.I balanced my tires on the shop(old school)wheel balancer & got them balanced.I still had a vibration at 70mph or more.I brought it to a known shop that has a road force balancer & was able to get them properly balanced & no more shaking
I had something like 30 pounds in their words at 1 end of the tire causing the shaking.They had to dismound tire multiple times to like up the heavy spot on the tire with the lightest spot on the rim.I could not have found out this without their equipment
Check u-joints like previously stated.If shaking is in steering wheel that is something in front end(suspension).But still have a through inspection done on suspension & bringing car to a quality tire shop with a road force tire balancer is the option for checking for bent wheel,flat spotted tire,or bad tire.I balanced my tires on the shop(old school)wheel balancer & got them balanced.I still had a vibration at 70mph or more.I brought it to a known shop that has a road force balancer & was able to get them properly balanced & no more shakingI had something like 30 pounds in their words at 1 end of the tire causing the shaking.They had to dismound tire multiple times to like up the heavy spot on the tire with the lightest spot on the rim.I could not have found out this without their equipment
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