What I was getting at is that even tho 2 tires
are the same size and brand, say 235/75-15
BFG ATs they wear at different rates, depending
on where the tire was mounted, so you get 2 tires,
one from the back abd one that was from the front,
now you have 2 slightly different sizes, not much,
but with the locker, a tire that covers lets say 1/4"
more ground per revolution at a freeway speed of
ohh I dunno 60 MPH, RPM of about 3500 divide by
gears of 5.12 thats 684 revs per min, x our 1/4"
is over 14 feet per min more ground covered by that
one tire, that equals about 3 inches per second push
on one side. Normally this difference would be absorbed
by the spider gears, giving a little more to the other slower
tire, helping it to "keep up" with the faster tire, but with
no spider gears, because of the locker, it pushes harder
instead on only one side, giving you a squirrely ride, it's
a consistent one sided push too, same size tires push
equally on both sides, and the sideways action goes away.