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Re: front end shimmy over 60 miles per hour
If you are experiencing a "shimmy" that only occurs at a certain speed, I'd suspect a tire balance issue. If it were in the alignment, the problem would manifest itself at all speeds not just at 60 mph. There's a chance that a wheel weight fell off or the tires have uneven wear. If you do have uneven wear on the tires, then you may worn front end parts that need to be dealt with. Incorrect tire pressure can cause uneven wear as well. Hope this helps.
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if the wheel alignment is faulty ( castor wobble ) at 70 mph there is no way that you can describe it as a vibration as it virtually rip the steering wheel out of your hands. If it is a torque converter problem then at around 3850-4025 rpm stationary there will be a vibration of the vehicle and engine The sort of vibration that you are experiencing at 70 mph will come from a drive line problem. If rear wheel drive then it could be faulty "U" joints, worn slip joint or failed rear engine mount
If front wheel drive it may be cv joints or bent drive shafts,wheel bearings or brake callipers not moving freely on the mounting bolts.
There are a lot of things that can cause it to shimmey, and there is not enought room here to explane it all. My advise to you is to take it to a frontend alinement shop and have it chk. out, could be serious.
Sounds similar to a problem I had...felt like a tire out of balance in the 50-60 mile per hour range. I just replaced the front transmission mount and problem is gone. This mount is very visible between the radiator and engine/transmission. There is an aluminum bracket mounted to the transmission with three studs/nuts. The front transmission mount is rubber with a stud/nut from top and bottom. The top stud goes through the aluminum bracket. The rubber around the bottom stud was torn on mine (but you cannot see until removed). First I removed the nut on the bottom of the mount. Then removed the nut on top of the mount...there were small holes in the metal which I placed a small screwdriver into to keep mount from turning. Then I removed the three nuts on the bracket. I located a sturdy area on the bottom of the transmission and jacked it up (do not jack on oil pan). I was able to jack up a few inches until I could wiggle the bracket and mount free without disconnecting anything else. Assembly is basically the reverse. Transmission mount costs about $65.