Carrier bearing and u-joints?.....

Install a crankshaft balancer.You want believe the difference.

Originally Posted by oneshot

Install a crankshaft balancer.You want believe the difference.

i was just going to suggest that----the harmonic balancer; Pittsburg power has some. You may want to check into that.


Also ribbed vs. lugged tires...........

Originally Posted by oneshot

Install a crankshaft balancer.You want believe the difference.

If your motor runs slightly rough it will vibrate the mirrors,to check this when you idling give enough fuel untill the vibration stops .If that happens than you know you need the tune the engine some how.Mine pete too had the same problem and find out that one of the injector spring was brocken,after replacement no more shakey mirros.My 2 cents

You didn't say if you're mirrors were shaking going down the road and that is what you are trying to control, or at idle. I would take the truck to a shop and have the idle on the engine adjusted until the mirrors quit moving. I've had to adjust the idle sometimes as far as 25 rpms. Every truck is different, different truck makes, poly motor mount, rubber motor mounts, and mileage makes a huge difference.