When I drive my 1986 S10 Blazer at 60 to 65 mph it will start shaking. Has all new motor mounts and new tires mounted and balanced, Also it has a squeek coming from the passenger side if I shake the Blazer or drive it, but when I make a right hand turn it quits. Any help.
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Re: Shaking at highway speeds.
As for your shaking at highway speeds, providing your tires have been balanced properly, it's probably a u-joint. If you let off the gas when it's vibrating, and the vibration quits immediatly, it's a u-joint. If it doesn't, it's a tire or wheel.
The squeak is probably a shock, but that would be a guess.
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I have this same car with exactly the same problem. Begins shaking at 40mph and stops shaking as soon as you let off the gas, but then begins again as soon as you press on the gas and smooths out as you get over 50. And the shaking is not felt through the steering wheel. Solution: Replace the transmission mounts. There are two of them, one on each side mounted on the frame right next to the shock strut. There is also a front and rear engine mount, but I replaced the two as described and shaking is gone.
rack and pinion is the steering wheel joint, so if the steering wheel shakes or handling has decreased, then i would say it is the rp. , also check the wear on the tires for uneven wear, it could be alignment, does the steering pull to one side? it could be motor mounts just find the bolts and check em wiht a torque wrench, also inspect mounting bushings as well. to check trans. give it alot of gas to get past 35-45 mph and the shaking should go away at higher speeds, if it doesnt then its the trans missing "third".
Have you checked the U-joints in the rear drive shaft? Also did this happen before the tires were replaced? Take the truck back to where you got the tires and have them check the balance, they should do this for free.