I have heard of the AW series on volvo's going to around 200-300k before needing a rebuild, though i have also heard people saying that have 500k and the tranny is still going strong, its really going to be your call, look at it does it shift incorrectly ( misses, slips, jolts ) or does it work fine, if it works fine replace the fluid and continue useing it till it starts to give you problems. if its a non turbo its probly the AW70L if its a turbo its most likley a AW71L, Though you can verify by looking at the transmission casing, there a black plate on the drivers side right on the pan line about and inch long and a half wide says the model right on it.