I raced my stang a lot for at least 2 race seasons pulling 1.9 and 2.0 60ft times. The car sat for 2 years, and not much longer after it was running again, with a slightly different setup (lower control arms and slicks), the axle snapped. Once it was fixxed it pulled a 1.7 60 ft. Now I can't say if it was because the axle had a lot of abuse on it already, or if the new setup was the cause, but I think 1.7's is pretty hard on the stock axles.