bad vibrations - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**MJN** · 01-05-2002, 09:33 AM

My '74 k/20 has a bad hopping motion at about 40-45 mph when slowing down. I have a 6'lift and stock wheels or winter on but had to use a driveshaft from a 71-72 k/20 for length. I goes away when I get on the gas and comes back when I get on the brakes. It feels like the whole truck is bouncing up and down. any help appreciated THanks.

C.J. · 01-12-2002, 09:33 PM

You might want to take your drive shaft in and have it checked for balance for the truck you put it in. If out of balance that will cause your hopping problem. If that is not the problem, it may be the front to rear allignment. Hope this helps.

01-05-2002, 09:33 AM	#1
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,051	bad vibrations My '74 k/20 has a bad hopping motion at about 40-45 mph when slowing down. I have a 6'lift and stock wheels or winter on but had to use a driveshaft from a 71-72 k/20 for length. I goes away when I get on the gas and comes back when I get on the brakes. It feels like the whole truck is bouncing up and down. any help appreciated THanks. __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com

01-12-2002, 09:33 PM	#2
C.J. Registered User Join Date: Jan 2002 Location: Brazoria,Tx,U.S.A. Posts: 4	You might want to take your drive shaft in and have it checked for balance for the truck you put it in. If out of balance that will cause your hopping problem. If that is not the problem, it may be the front to rear allignment. Hope this helps.



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