I just got my car back today and while driving on the freeway at about 60-80mph (80 being the fastest I went) the car began to vibrate in the passenger compartment, being strongest under the center console. The vibration only at high speeds. And the vibration seemed to be in pulses. What could be giving off this strong vibrations?

O'yea, and seems a lot stronger when I'm decelerating.

 

Might check the tires(balance) (back tires). .Drive shaft?

 

Driveshaft needs to be re balanced. Also re do the tires while your at it.

If its not either of the two i would check out all your bushings and rubber. LT cars are old.

 

I have the same problem with mine. First check your tires for balance. Next would be the driveshaft. Check it for balance. If it checks out (like mine did) then check the u-joints. Start with those and see if you find anything.

 

Check your pinion angle, mine was doing the same thing with a pulsing vibration at freeway speeds. After I checked, then adjusted the pinion angle a little(-1 degree) the vibration is gone!