07 W900

Jiffy

Take a look at the drives too. The drives steer the front axle. The rear axles have to be parallel to each other and the front axle, square to the frame and the wheels have to be equally spaced in between the frame rails. I had the death wobble too, got all the above stuff adjusted and it is gone.

Put your truck on flat concrete and get on your knees and eyeball down the center of your drive tires front to back or back to front or hold a string at the center of your drives across both tires I bet you have gaps which means your drives axles are not parallel. This is a good place to start.

Also do you have balanced brake drums?

Hope This helps
Mike

 

A dry 5th wheel plate will cause some front end shake too.

 

As will ride height I've seen trucks with bent leveling valves do crazy stuff. My buddy's truck we looked it over and over and changed about everything ended up putting it on the dyno to see if it did it there without the front turning bam still there so it's in the rear, ended up being a bad slip yoke and carrier bearing just a idea

 

Try this in tires before you buy new.

http://www.thetruckersreport.com/tr...259176-junk-capped-drive-tires-wont-stay.html

 

check front end alignment and inspect rims to see if bent before spending a lot of $$$$

 

Check Cab mount bushings , wheel hub bearing free play;