yung '86 boxtype gsr ko nagwi-wiggle when running at 60kph and above, pati yung steering wheel nagwi-wiggle din, malakas.
pag straight yung daan, umaabot ng 70kph without wiggle, pero once me un-even road or kahit konting lubak lang dun nagwi-wiggle. minsan kahit 40kph lang takbo ko pag me un-even road nagwi-wiggle pa rin.
tires are ok naman, though surplus lang sila, more than a year na rin pero makapal pa.
Front suspension parts mo bro mukhang me tama na. It could be a combination of your tie rods, rack ends, sway bar, balljoints. Have it checked immediately as this could be a dangerous proposition should you continue to drive your car without having your car checked and have the necessary components replaced.