Hi guys, I am new in the forum, I have an FZJ80 rig, and since I upgraded my tyres from 275/70R16 to 285/75R16 I am getting shift problems, it shift hards from 1st to 2nd and from 2nd to 3rd, and the transmission looks decontrolled some times, it some times it shift while is was not supposed to, it for example shifts hard when not accelerating mainly when in second gear, can you please guys help me on this, is it tyres consequences or another thing.