It's the same as replacing a metro axle and pretty much any front axle with independent front suspension. Just like Loren said. Unbolt axle nut, ball joint, tie rod end(just to make it easier to move spindle around), axle just pops out of the transmission wit a prybar. The axle nut locks in place by being bent into a notch in the axle, make sure you pry it back into a round shape before removing the nut otherwise it'll screw the threads on the axle and nut. I've done it. Once. Otherwise I've had no need to replace any axle's in our fleet. Most cars we've got range from the same to more than double your mileage.
100k seems early to need to replace an axle from what I've seen unless it's hit a few curbs or driven hard with the wheels cranked a lot.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)