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I bet it shakes under light/moderate acceleration and will also stop shaking if you let off the gas?
If so your best bet is to bring it to someone who is very good with driveline. It is fairly common for worn drive axles to cause this symptom however an engine misfire will also cause a similar symptom.
at 45 miles an hour overdrive engages putting a lot of load on the engine. Weak ignition components can cause a misfire that only shows up under this extreme load. It is very important to have somebody who is very good at solving these issues take a look at it and determine exactly what it is. I have literately had customers admit defeat after installing every ignition component, every sensor, and even transmissions only to find out a few hundred dollar drive axle was the problem.
If you've had this or a similar problem for two years the car is well overdue for a visit to the auto doctor. If it had been fixed early, it would probably have been cheaper than it will be now. The one problem may have grown into two or three by now.
This could be a lot of things. The first thing to check is the tires. Make sure they are not flat spotted from sitting too long .Then you need to check motor mounts and make sure they are not broken or loose. There are many things that could be causing this.
Start by checking the tie rod ends on both sides on the front wheels..With the truck jacked up and jack stands underneath the frame both left and right wheels should be suspended in mid air..The are two tie rod ends on each side of the vehicle, a inside and outside tie rod..Check for any excessive place on each one... Also ckeck the balance on all four tire's... Inspect the wheels for any stress cracks that would cause them to not to balance correctly and make your vehicle shake... Check the transmission mounts on the cross member,make sure the mount is secure to the Trans and cross member mount..Also check both u-joints on the drive shaft and any hanger bearings that may be underneath there..If it's a 4 wheel drive check both drive shaft's...Anyone of these option's could show those symtom's you mentioned...Good luck and let me know how it works out..
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.
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