Peterbilt 386 vibrates

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Trans , or motor mounts. Then check the trans it self. Start cheap a day easy to fix problems. ,u might be able to replace mounts yourself

 

Tandems Mis-aligned and/or irregular tire wear on drives or bad tire (probably steer)

And, if it turns out alignment was off and caused irregular tire wear (cupping) on tandems or steers, correcting the alignment won't make your ride issues go away. Once irregular tire wear is set, it's set. Welcome to trucking - owner's side.

All that "big money" that the owner-ops are said to be making? Get ready to part with some of it ... or learn to "embrace the shake"

 

And to make a bad situation worse, concerning alignments... IMO, half of the techs who do alignment work don't know what they are doing and often will take a perfectly good alignment [done as a "preventive checkup"], and screw it up. So try not to skimp too much when choosing a mechanic.

 

Jack up your steer tires. Put a straight line right next to them like a ruler or a sledgehammer. Spin the tires. If they are out of round, you should see it easily.

 

WTF... Did you forget to place a decimal in that figure!