Drive Train Specialists, Trutrac posi

The Detroit True Trac is the best all around unit

The True Trac has a lock up of 70% to 75%. This unit is for the driver who spends 70% on road and 30% off.

The next step up is the Detroit Soft Locker, this unit is also clutch free and uses no oil additives. While under power or a load the Detroit Soft Locker is a 100% lock up device. The Detroit Soft Locker has a unique working internal system that allows the unit to ratchet around corners. When you do suspend a tire and it is free-hanging off the ground, both tires will still rotate the same speed.

This unit fits the driver that spends half their time on-road and half their time off. While the unit does work nicely for daily driving, most agree it is the best off-road differential on the market.

I cut and paste that explanation lol, I have always used the Detroit locker in my stuff (drag/street car and 4x4) they are tough 8)