Hi all,
A friend has a Gen II Hemi-powered 1970 Barracuda, with Keisler 5 speed transmission. This car has been on the road for several years now, with no issues. Yesterday, he ran it through the gears, up to 4000-5000 rpm, and a fairly severe vibration started happening. He hasn't done any driveline work on it recently, nor changed tires/wheels, or anything like that. He crawled underneath to look for anything obvious, found a slightly loose nut on one of the transmission crossmember bolts, and tightened it - with no change. I suggested he check for a missing drive-shaft weight, or wheel weight. Any other ideas on what could cause this to happen? Thanks for any suggestions.
Edit more info: he says it seems to be speed-related, not rpm related. It starts at about 85 mph, 4000 rpm in 3rd gear, gets worse as speed increases.
Roger
If it seems "speed" related start looking at tires (physically swapping/rotating F to R, side to side to see if the vibration moves from F to R/side to side) to determine if a belt broke, or weights are missing, look at the U joints, replace if needed, wheel bearings/axle bearings, rotors, etc....
