the only bad patch is from chilas to raikot bridge... rest all is no problem,,, two or three small bad patches of 20 to 50m are there from naran to jalkhad (no prob. take ur vehicle with care)... then till kkh (chilas) road is excellent. from raikot bridge to gilgit... u wont find any single bad patch. road is excellent.
the only part is chilas to raikot bridge.. ofcourse its a running road and you can take ur axio with care.