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**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.

01-05-2002, 09:33 AM	#1
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,095	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