Highway speed vibrations.
Thread Starter
Junior Member
Joined: Oct 2010
Posts: 54
Likes: 0
From: New Orleans, LA
Car: 1983 Camaro Z/28
Engine: 305 HO
Transmission: 700r-4
Axle/Gears: stock
Highway speed vibrations.
I have an 83 z28. I have the car lowered, with panhard bar with new shocks all the way around. New front and rear sway bar poly bushings and end links.
New 18 iroc rims on front and 20 on rear. Wheels and tires are freshly balanced. Around 60-75 the car is vibrating pretty bad. I would like to know if there is anything else I can change replace or adjust to correct my problem. I can’t tell if it’s from the front or rear. Randy
New 18 iroc rims on front and 20 on rear. Wheels and tires are freshly balanced. Around 60-75 the car is vibrating pretty bad. I would like to know if there is anything else I can change replace or adjust to correct my problem. I can’t tell if it’s from the front or rear. Randy
Supreme Member
Joined: Sep 1999
Posts: 3,009
Likes: 815
From: Colorado USA
Car: '83 Firebird (T/A Clone)
Engine: 350 with L-69 components
Transmission: 700R-4, 2000 RPM stall converter
Axle/Gears: 10-bolt/3.73 ..
Re: Highway speed vibrations.
Wheels are probably not true. I had this problem with brand-new wheels from Circle Racing. I will NEVER do business with them again...
Thread Starter
Junior Member
Joined: Oct 2010
Posts: 54
Likes: 0
From: New Orleans, LA
Car: 1983 Camaro Z/28
Engine: 305 HO
Transmission: 700r-4
Axle/Gears: stock
Re: Highway speed vibrations.
I hear ya. These are American racing replicas from summit. The tires are an off brand lionhart. They balanced true.
Supreme Member
iTrader: (1)
Joined: May 2015
Posts: 1,154
Likes: 89
From: Temecula, CA
Car: 1989 Pontiac Formula 350
Engine: L98
Transmission: 700R4
Axle/Gears: BorgWarner 3.27 Posi
Re: Highway speed vibrations.
What about drive shaft and u-joints?
Swapped my drive shaft and all my woes went away in the vibration department.
Swapped my drive shaft and all my woes went away in the vibration department.
Thread Starter
Junior Member
Joined: Oct 2010
Posts: 54
Likes: 0
From: New Orleans, LA
Car: 1983 Camaro Z/28
Engine: 305 HO
Transmission: 700r-4
Axle/Gears: stock
Re: Highway speed vibrations.
I never really looked at the drive shaft. I’ll swap them out. And see. Thanks. Your driveshaft was out of balance?
Supreme Member
iTrader: (1)
Joined: May 2015
Posts: 1,154
Likes: 89
From: Temecula, CA
Car: 1989 Pontiac Formula 350
Engine: L98
Transmission: 700R4
Axle/Gears: BorgWarner 3.27 Posi
Re: Highway speed vibrations.
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Highway speed vibrations.
You might check the trans mount, especially if you're running poly.
JamesC
JamesC
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Joined: Sep 2010
Posts: 1,626
Likes: 46
From: Double Bratville
Car: '89 Formula
Engine: LS2
Transmission: 4L65E
Axle/Gears: MW 3.42 12 Bolt
Member
Joined: Aug 2015
Posts: 117
Likes: 2
Re: Highway speed vibrations.
First have tires road forced and indexed to wheel properly. Most good tire stores or Dealers have the proper balancing machine to do this. A tire can be balanced put still vibrate from high road force readings. We do this daily with vibration problrms.
JOE
JOE
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