Torque biasing differentials are pretty cool. 

I’ve never heard of that brand before but Quaife and Detroit Tru-Track are top notch.  Maybe wait a bit until more of those hit the streets and there are reviews?

As an alternative.

I have a Currie 8” traction lock that i purchased through Summit several years ago.

It’s been quiet and reliable so far.
Requires friction modifier as usual.

It will outlast me.

Definitely don’t cheap out for an important part that will stop you in your tracks.

I know for me, it’s a spirited driver.
I was realistic about what i needed.

Just depends on how you will use your car.

SpeedMaster is an Australian based company that opened doors in 1979.  I suspect it would be a strong unit though it the information on the web is limited.  I definitely would not want a unit that contains clutches and friction modifiers after watching the following video because there is just better technology available.  This guy works for a company that services mostly the 4x4 applications.
https://www.youtube.com/watch?v=x40WGUtdaLI 

Regarding Speedmaster, it would really be helpful if someone would post a link to recommended carriers that would fit a Ford 8" 28 spline.  I don't really find the alternative parts.  The selection is limited for the 8" carriers.

The video discussing the different types of lockers mentioned the issue with having a wheel in the air.  He said the military uses this type of locker and teaches the soldiers to apply partial braking if a wheel is in the air.  He said this provides the load needed to the wheel in the air to cause the locker to engage and allow the other wheel to pull away.

Thank you for the information regarding SpeedMaster.

Rufus68 wrote:

The video discussing the different types of lockers mentioned the issue with having a wheel in the air.  He said the military uses this type of locker and teaches the soldiers to apply partial braking if a wheel is in the air.  He said this provides the load needed to the wheel in the air to cause the locker to engage and allow the other wheel to pull away.

Thank you for the information regarding SpeedMaster.

The partial brake is a trick that will even work with an open rear.  I've seen guys run two parking brake levers on some trail rigs to apply the e-brake to only one rear wheel at a time.  That way you can trick the diff into thinking the wheel with more traction actually has less. 
 

I removed a traction lock and replaced it with a tru track from Eaton.  The car immediately started launching in a straight line instead of fish-tailing!   Apparently it is better at getting both wheels going the same speed.

MS wrote:

I removed a traction lock and replaced it with a tru track from Eaton. The car immediately started launching in a straight line instead of fish-tailing! Apparently it is better at getting both wheels going the same speed.

They are sometimes referred to as "torque sensing" differentials, and that's accurate.  They are going to send power from the wheel with the least grip to the wheel with the most grip, and that can happen many times, back and forth in a short period of time.  On a launch the chassis twists and simultaneously puts weight over the right rear wheel and unloads the suspension of the left rear wheel.  This disparity of grip, even with an LSD, causes the car to crab walk to the left, then driver correction and changing chassis dynamics send it right, left, etc. 

An LSD is kind of a one trick pony.  Its locked until its not.  A TrueTrac is a much more refined system.  What's crazy is that even with the added complexity I've never heard of anyone breaking one.