Thanks for this.
Can you give suggestions as to locker vs LSD? And more info on the regear? Is that a separate purchase? What are the benefits/downsides?
Locker - when engaged, power delivered to both wheels evenly, both wheels turn at same speed, maximizing traction.
This is the go-to for off road applications.
Pros: Maximize traction, stronger differential (with ARB $$$), less maintenance than LSD (arguable for ARB, definitely not less than a TruTrac), cheap (for auto-locker)
Cons: price (for selectable locker), complexity (for selectable locker)
LSD - when engaged, attempts to deliver power more equally, but doesn't actually lock.
Most people don't use an LSD off road unless you go with a helical design like the TruTrac.
Pros: cheaper than selectable locker (with TruTrac)
Cons: doesnt lock, less traction, more maintenance (except with TruTrac), expensive (compared to auto locker), less options
Regear - regear makes sense to do at the same time as a locker. Mostly not needed unless you are running bigger tires. A regear basically allows you to trade some top-end speed for acceleration/torque or vice versa. People do this when running bigger tires because bigger tires essentially changes your final drive ratio such that you lose a lot of acceleration/torque.