Front End Shakes

Anytime you have a sustained shimmy or shake at a certain speed you have tire or wheel that is out of balance or out of round, period. Alignments do not fix shimmies. Suspension parts do not fix or cause sustained, speed related shimmies, tires or wheels do. If you feel the shimmy in the steering wheel the problem is indeed with the steer tires or wheels. Your steer tires need to be spun up to see if they are spinning true. This always need to be done, new tires or not, when there is a shimmy problem. You can throw new suspension parts at it, and balance it all you want, but if the tire/wheel doesn't even spin true it will always have a shake. You can have tire to rim mis-mount, which causes the tire to have a high spot and run oblong on the rim. You can also have rim to hub mis-mount where the rim isn't perfectly centered on the rim and causing the whole wheel to run oblong. This also explains why the problem is still there even after new tires have been installed. When you spin up the tire you will be able see if the tire running true or not. You will see the tire going up and down as it is spinning. From there you can see if the tire is mounted properly on the rim, or if the whole wheel is slightly off-center on the hub itself. If tires are installed without enough or proper tire mounting lube they will not center fully on the rim and become mis-mounted. The centering tabs on the hub are not precision machined and a lot of hubs have small clearances between those centering tabs and the inner diameter of the wheel. When the wheel is installed and pulled down by gravity when it is bolted up it will be off center as it rolls. If you have tire to rim mis-mount, deflate the tire, relube, spin the tire on the rim 180 degrees or so and reinflate. Try not to use those cheater cannons as they tend to aggressively blow the tire up off centered which causes the very problem you are trying to correct. With the rim centering, those auto-centering wheel nuts work really well.

 

If your old steer tires were cupping and you had a shimmy at that speed I would say spring hanger bushings.

On my 2005 Freightliner there was a HORRIBLE shake in the steering wheel between 45-60MPH......I was also having tire cupping issues (50k on a new set of steers) Spring Hanger Bushings were replaced and NO MORE shaking!! Same drums, tires, and rims were used............