Currently, exhaust
brake usage can cause high temperatures in the automatic transmission due to
torque converter slippage. Only 10% to 80% of the retarding force is
transferred through the fluid coupling of most torque converters. The BD
AutoLoc commands the lock-up clutch of the torque converter to stay engaged
when the BD Exhaust Brake is activated. This allows up to 100% of the
retarding force to be transferred while in 3rd and 4th gear. Also,
transmission oil temperatures will remain low because of little or no
slippage occurring in the converter in these gears.

Maintains lock-up when the exhaust brake is activated
Ensuring 100% of the retarding force is being transferred in 3rd and 4th
gears
Prevents slippage and subsequent high oil temperatures