^^^^^ X 10
Can't tell you how many SD's I have pulled out because the ESOF system did not work. Between the Pulse vacuum problems and the hub failures, there have been many SD owners stuck in some embarassing situations.
Both of my SD's and even the Excursion all have aftermarket manual locking hubs.
(Actually the 02 has a complete Dynatrac pro-rock 60, and the Excursion has the 60 that came out of it, with Dynatrac bearing conversion, and 35 spline outers.)
Anyway, one way shape or form, they all have manual locking hubs, don't get me started on unit bearings! LOL.