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#26 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: Chasing vibration
I had like 15 year old tires that did that.
Thought it was pinion angle, nope, carrier bearing, nope. Replaced rear tires, smooth as glass.
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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#27 |
Registered User
Join Date: Oct 2010
Location: Kingsburg, Ca.
Posts: 92
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Re: Chasing vibration
Same here, 67 Dodge Dart had a rumble that cycled on & off at hi-way speeds. Figured it was something that was rotating until I discovered I could hear the rumble just sitting at the curb in neutral. The transmission mount had lost the rubber damper and there was a metal to metal contact allowed. New trans mount and quiet cruising was restored.
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#28 |
Registered User
![]() Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: Chasing vibration
The 2 that caught me by surprise were , pinion bearing , and shocks
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68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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#29 |
Registered User
Join Date: Aug 2018
Location: Bronx, NY
Posts: 215
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Re: Chasing vibration
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1981 C-10 Longbed, 250 (4.1) 2bbl Varajet, THM-350C. Some of the Build progress: https://www.youtube.com/channel/UC_W...foLyeDq_WQPNmA 1981 Harley Davidson. Credentialed, semi-retired A.S.E. technician. If you don't like free advice, Ask Someone Else and pay for it. |
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#30 |
Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,076
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Re: Chasing vibration
Call me dumb but I'd ask where the op feels or hears the vibration; steering wheel, butt, whole truck? Maybe I'm oversimplifying, but the waveform interactions in the posted pic seem so show two equal bu opposite waveforms of the same frequency. The combination on of equal same frequency sine and cosine waves will canceleach other out and there will be no harmonic. The 2 frequencies have to be different for the amplitudes to add/subtract. Chances are the pic is just to give a simple illustration and not actually representative, or the frequency difference is sbtle and I missed it....
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#31 |
Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,482
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Re: Chasing vibration
My 72 has the same vibe. Put all new u joints center carrier bearing and tires. Its between 55 and 65 . But if I pop it into neutral going downhill it goes away so I'm thinking it's not the shaft or tires. Thinking it's the motor or trans mount or a compo of both.
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Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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