[AT] OT truck tires/driveshaft?

[gdotfly at gmail.com]

John, can you determine the frequency? A driveshaft will have a higher frequency than a tire. Typically a driveshaft vibration will not go away with speed, but a tire will. Two or more tires will come and go in frequency and become less noticeable at speed. I would check tires for tread separation or other damage.


Gene






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From: jtchall at nc.rr.com
Sent: ‎Sunday‎, ‎May‎ ‎11‎, ‎2014 ‎5‎:‎29‎ ‎PM
To: at at lists.antique-tractor.com





Been a little quiet so I’ll throw a problem out looking for suggestions. Got a 74 Ford F-600 2 ton grain truck. Around 40 mph I get a BAD vibration (empty or loaded) It goes away around 50 or so. I put new tires on the front a couple years ago and moved one of the old ones to the back. Shortly thereafter we noticed the vibration. It seems to be getting worse. I had the front tires balanced last fall, didn’t help. I shuffled tires around on the back yesterday, can’t really improve the situation. I even tried driving with only the inside tire mounted, maybe some better, but not much. The back tires are not a matched set and are pretty old. I know it could use a set of tires but I’m trying to hold off a little while longer buying them. I jacked the truck up so I could look for runout and wobble. Some of the tires have wobble, some have runout on the diameter. One is perfect, but it is so far out of balance that with the truck in neutral, it settles to the same place every time—I even replaced this with a spare, still haven’t solved the problem. Would a set of new tires solve my problem or are big old trucks like this forgiving enough that I have other trouble? All the u-joints feel tight and I only notice a faint bit of runout on the driveshaft. An old timer told me he thinks I have a u-joint trying to lock up or a twisted driveshaft. Dad says they once twisted a driveshaft on a truck we had by popping the clutch when it started rolling backwards. Whats your opinion?

John Hall
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