Both 4x4 saf's i have owned both did the gearbox's but i own a two wheel drive now and am seriously contemplating getting another 4x4 cos i miss them.
Each time my box went duff the first time it cost me 350 to get sorted and the second time about 400 but they never let me down once they had been repaired.
If you're new to em get a 4x4 they drive so much better i think