My toyota tacoma started bucking when i would hit speeds of 45-50mph i brought to a mechanic and he said i needed new tires becuase there were flat spots (which i thought were becuase of the bucking) i replaced the tires and the problem still exsists. to me it feels like the tires are locking/releasing at a very fast pace , allmost feels like im driving down a gravel road.
Could easily be a number of things, but most of the time when i see cars with this problem the struts need to be replaced,or its the oxygen sensor, or people aren't putting the right gas in. (i.e. putting regular when the car needs premium.) but if you havent changed your type of gas then i'd focus on the struts and sensors.
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the cars tires and wheels are just like music instrument they have resonant frequencies. so SPEED changes that. no man on earth blinded by internet can help you. we can guess. but why do that, you then spend a fortune on useless parts. ever heard of a mechanic, and ASE mech can fix this easy. BTW noise and vibrations is complex. on all machines. the factory FSM has a chapter on that , why not read that.>?
in my small town 250k we have a suspension shop they can find any noise, and any vibration. let them! and btw 2 some tests are very dangerous. btw3, they do have on car tire balance, this finds other problems.
they might charge $100 to find the reason. is that too much, or is buying $1000 in parts not needed ,better. for sure i can find it , but for sure, not here.
remove the tire
Remove the caliper- two bolts in back, could be torx or allen
remove the bracket that holds the caliper- two bolts in back
remove the rotor, with hammer if nessissary
remove the big nut holding the shaft in the middle of bearing
there are three or four bolts that are in back that hold the bearing on the spindle remove these
use a screw driver and chisel to pry the bearing out of the spindle, you will have too beat on them so use an old screw driver. If the new bearing comes with the hub, then you can beat on the hub and knock it out. be careful because your limited on space and it is easy to hit something that you don't want to hit. If the new bearing doesn't come with the hub, you will have to have it pressed out and in. about twenty bucks at a garage.
Find a tire shop that has a HUNTER GSP 9700 road force balancer. this puts a load on the tire and will find a bad tire, or rim, and it will tell the operator where the tire should be orientated on the wheel for best run out. If its a tire/wheel problem this will find it. Call a high end tire store or dealer and ask if they have one.
I would really have that exhaust checked again, as well as have mechanic put fuel pressure gauge on & drive it up to that speed and see what happens fuel pressure wise. With exhaust, it's not only cat converter that could be causing reduced flow.
I don't know how loud the noise is, but its weird that you mention 50 mph. At that speed or above you are keep a constant rpm level. I say this because it might just be your air box loose and the sound of the intake air is making it. A 2008 truck should not have any major problem. Sometimes an alternator will sing or whine but never heard anyone say something is whistling. One other thing is sometimes for some reason ive heard a noise like that coming from the speakers of my car that goes up and down with the speed of the motor, but that was when I was tinkering with speakers and sub outs and amps. Thats all I can think of.