Try the search button. I think lthere were two Husqy models with traction assist (when I bought mine last JUly). Mine has the locker and requires that you use the dash switch. I believe the other yard tractor has a limited slip that operates automatically.
Hydrostatic transmission with locking differential
The pedal operated hydrostatic transmission offers a smooth, variable forward and reverse speed while the standard automatic locking rear differential increases traction while cutting on slopes or wet grass.
