I've heard a lot about steering shake, death wobble whatever you want to call it on lifted trucks with taller suspensions and larger tires but I seem to experience it when I use the brakes with anything more than a feather weight effort while at highway speeds. Once I get down below maybe 60mph or so it goes away and braking is smooth. Its just the harsh side to side wobbling of the steering wheel on moderate and heavy braking on the highway speeds... Would this be solved with a steering stabilizer, or??

 

I'm just guessing, but it sounds like the gas build up on the pads/rotors that can give the feeling that the rotors are warped. Never had the issues so I did not look into it. Do a search there may be some tricks to get rid of it.

 

My old truck was like that except mine was when braking around 45. Ended up being a combination of warped rotors and also the alignment bring slightly out which made it wobble more.

 

Install new Motorcraft pads and rotors. They can be purchased from www.rockauto.com.

 

Just to be clear this is steering wheel shake without brake pedal vibration which occurs only at higher speeds. It doesnt happen at lower speeds even with heavy braking effort.

Last year i did have to turn the front rotors due to some vibration but the pads were in great shape and I didnt have any other issues.

 

Rotors could still be warped. Turning them is hit or miss on length of time you'll get out of them.

Have you tried moving the front tires to the rear to see if the shake moves from the steering wheel?

 

How many miles? I've had vibe and shimmy issues for the past 6,000 miles, it started around 42,000 miles and has not improved. My vibe occurs above 35 mph and the front end shimmy is between 72 and 77 mph. I replaced rotors and pads and it took care of the high speed steering wheel shimmy when braking above 60 mph.

When were the Cooper tires installed?

 

Just over 50,000 now. Coopers were installed about 8k miles ago, and in fact this may or may not have started after the first rotation- I will have to try that now that I think about it. Otherwise I'm kind of at a loss as I don't want to start throwing money at it in a shotgun approach.

 

Rotate back to original install position and see if it goes away. If so, you have a wheel out of balance, or a bad wheel and/or tire. You will need a Road Force Balance to check the wheels and tires. Most Ford dealers can accomplish this, but I do not trust them to do it properly.