Currently, exhaust brake usage can cause high
temperatures in the automatic transmission due to torque converter slippage,
and, only 10% to 80% of the retarding force is transferred through the fluid
coupling of most torque converters. The BD Torq/UnLoc commands the lock-up
clutch of the torque converter to stay engaged when the BD Exhaust Brake is
activated. This allows for up to 100% of the retarding force to be
transferred in 3rd and 4th gear and the transmission oil temperature to
remain low because of little to no slippage occurring when the converter is
in these selected gears. The BD Torq/UnLoc is also able to prevent the ECM
from activating the lock-up clutch when such an action would drag the engine
rpm out of the optimum torque range, or, when traveling at such speeds that
would cause the ECM to cycle the lock-up clutch in and out.

Prevent the ECM from activating the lock-up clutch when such an action
would drag the engine rpm out of the optimum torque range, or, when traveling
at such speeds that would cause the ECM to cycle the lock-up clutch in and
out
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