My 4runner starts to vibrate around 55. The engine gets loud and seems to struggle!?! It runs great <55mph. I changed the U-joints and not sure if the drive shaft needs to be balanced but I wouldn't think that would make the engine/tranny shake like that. The diagnostic spits out a ABS sensor code which I"m not sure if its related...any ideas???

 

Just some ideas idk for sure but you may have warped brake rotors, tires could be outta balance, idler arm and the like may need replaced, steering may be loose...I don't know what that code is though these are just some things that make these trucks shake