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05-28-2012, 10:33 PM
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#1 |
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Registered User
Join Date: Aug 2009
Location: Oregon
Posts: 611
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Vibration at 60mph...
My truck starts making a terrible noise at almost exactly 60mph from the rear passenger side. It sounds/feels like I'm driving on the rumble strip beside the highway. Below 60mph, it doesn't make the noise at all. Above 75 it starts to go away again.
Anybody have any thoughts on what is wrong? I'm thinking either the driveshaft is out of balance or the tire. (I've got 33s) It's been doing this for a long time, I just rarely drive above 60mph. 
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'73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's. You can set my truck on fire and roll it down a hill, and I still wouldn't trade it for a Coupe de Ville. |
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05-28-2012, 11:17 PM
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#2 |
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Registered User
Join Date: Jan 2012
Location: Farmington New Mexico
Posts: 43
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Re: Vibration at 60mph...
What condition are your tires in? My 76 did the same thing. Look at the tread on the tires for un even wear. My tires had less than 1000 miles on them but they started to separate from age and weather rot. Driveline vibrations are usually found at 30 mph and under. Good luck
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ASA Chapter Lead-New Mexico/Arizona 75 C10 Scottsdale. 454/400th. 373 rear 76 C20 Custom Delux 350/4 speed 411 Posi rear |
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05-29-2012, 01:44 AM
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#3 |
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Registered User
 
Join Date: Mar 2012
Location: Okanagan Valley, BC, Canada
Posts: 1,237
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Re: Vibration at 60mph...
My truck started to do the same thing right after I installed a set of used front tires. Vibration from 90-95km/h. Below or above that speed is smooth.
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05-29-2012, 01:46 AM
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#4 |
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Registered User
Join Date: Aug 2009
Location: Oregon
Posts: 611
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Re: Vibration at 60mph...
Hmmm...my tires are a bit cracked from weather but do not have that many miles on them. The tread looks evenly worn. Maybe I should try rotating the tires?
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'73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's. You can set my truck on fire and roll it down a hill, and I still wouldn't trade it for a Coupe de Ville. |
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05-29-2012, 07:02 AM
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#5 | |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,177
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Re: Vibration at 60mph...
Quote:
As an aside - here is a link to a flow chart for vibration diagnosis. If you walk through the last few pages it will show how to "divide and conquer" any vibration problem, whether engine, driveline or tire related. http://67-72chevytrucks.com/vboard/s...d.php?t=522180 K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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05-29-2012, 07:16 AM
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#6 |
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Registered User
Join Date: Oct 2011
Location: hudson,wi
Posts: 805
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Re: Vibration at 60mph...
I'd buy new tires. It sounds like you need them anyway.
RIZ |
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