Which wears fastest?

Right rear

 

The rear axle usually wears faster, if your hard on the throttle and bang though the gears hard, they'll wear even faster on the rear. We don't see much difference left to right at all, but if you get is places where your spin, the right rear would spin easiest and could wear faster. We run an odd size tire (255/70R22.5) and only average about 150,000 miles on a set of drives. We typically rotate drives when the rear axle is 2-3/32" less than the front. Some of our drivers can get 175,000 miles out of a set without only 2-3 rotations over the life of the tires. On the other extreme, we have a driver we nicknamed Toggle Throttle that can barely get 100,000 miles and we have to rotate them every 25-30,000 miles.

 

Weight and hills also factor in. I pulled trains over some monster mountains out here, grossing 115,000 every day. Never got 100,000 miles out of a set of drive tires

 

Also....Typically the first seal to go is the Right Rear

 

My right rears always wear down faster. I just rotated my drives for the first time (on this set of drives) in a criss-cross pattern a couple of months ago. I gauged them when I did but can't remember the 32's. Only that the right rear was several less than all other positions. I will probably run them out from that rotation. *Might* rotate them one more time swapping lefts to the right and vice versa but just depends on how the tread depth ends up before the meat has all been worn off the treads.

 

my rear drives always wear faster. my routine is to put 4 new on the rear, by the time the front rear is ready for a new set, I have enough time to recover from the money spent on the first 4.

 

right rear, then left rear then right front and left front wears the least.

 

I don't think it matters which one wears quicker. Soon as one shows any wear (generally heal & toe), rotate them. Btw, I always buy drives as a complete 8, different sizes aren't going to do the diffs or power divider any favors.

 

It's the rear axle because it is driving the truck through turns and it's always under power from the driveshaft.