weird vibration at speed 60 plus - The 1947 - Present Chevrolet & GMC Truck Message Board Network

75chev4x4 · 09-17-2012, 10:16 AM

I have a 75 k20 with a 350/400 and have noticed a weird vibration when on the freeway. It is only at about 3k rpm so I'm guessing around 60 mph speedo doesn't work I get a vibration in the drivetrain it feels like. After 3k and up the vibration gets faster. It will vibrate for 1 second then stop for a half second then back again. It kind sounds like a train going by and as you go faster it does too. No vibration at all before 3k then it just starts. I have brought it up to 3k plus in park with no vibration so its not in the motor. Any suggestions?

09-17-2012, 10:16 AM	#1
75chev4x4 Registered User Join Date: May 2012 Location: Estacada, Oregon Posts: 254	weird vibration at speed 60 plus I have a 75 k20 with a 350/400 and have noticed a weird vibration when on the freeway. It is only at about 3k rpm so I'm guessing around 60 mph speedo doesn't work I get a vibration in the drivetrain it feels like. After 3k and up the vibration gets faster. It will vibrate for 1 second then stop for a half second then back again. It kind sounds like a train going by and as you go faster it does too. No vibration at all before 3k then it just starts. I have brought it up to 3k plus in park with no vibration so its not in the motor. Any suggestions?



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