93 Silverado Floor Vibration

[nphiker]

I have a 93 Chevy Silverado K1500 4x4 Reg cab 130000 miles, the best description; I have a buzzing vibration under my feet. I feel it when I first start the truck in the morning at cold idle 1000 RPM. It seems to follow the RPM’s and the rumble of the exhaust when starting out and coming up to street speeds 5- 45 mph. The vibration is more intense when it shifts into overdrive and the RPM’s drop to around 1400 RPM and the motor lugs.

The vibration smooth out as the RPM’s come up to around 1800 RPM’s and I’m traveling at highway speeds. But I can feel the vibration migrate into the steering wheel and in the seat where my legs rest at highway speeds of 60-65 MPH. The vibration moves thought out the floor, Not always in the same place depending what RPM’s / Speed your at.

The only thing I have done to the truck before this is I had it undercoated and I don’t remember any vibration when on vacation I put on 1200 miles.

The garage thought it was the exhaust. So they installed a new walker exhaust system from motor on back. $1000.00 later and still has the same vibration and a grand less in my account. So I’m turning to you guys for some help before I spend another dime.