Guys, I have been chasing a problem for quite some time with "latteral" shimmy when over 55 mph+. It doesn't wobble on flats, sometimes on down hill grades and always on uphill or underload.

I have replaced shocks, springs, bearings, tie rods, adjusted steering box, had the drive line rebuilt and balanced, rear end rebuilt, tranny rebuilt with new torque converter, Pro Comp Control Arms, new DSS track bar and steering as well as new transmission mounts.

Just wondering if the engine is flopping around? How do I test for bad/broken motor mounts?

 

stand on the brakes (put it in 4x4) and load up the engine leave the hood open and have some one watch(stand off to the side) to see how much the engine lifts/twists.

 

Just curious, have you checked the wheels and tires on the truck? Bent rim or out of balance or out of round tire?

I'm not saying it couldn't be the motor mount but I would think a wheel or tire that is bad could make a shimmy like that too.

 

Had the wheels checked when I had new tires put on 2200 miles ago. Went with Goodyear Duratrack. Balanced and aligned