If your torque converter is not locked up when the exhaust brake is applied, you are only benefiting from a fraction of its retarding power. The BD AutoLoc commands the torque converter to lock up, and stay locked up, any time the exhaust brake is applied in third and fourth gears. This not only helps with engine braking, but because there is no clutch slippage, transmission oil temperatures remain low. The lock-up clutch and exhaust brake automatically disengage at low speeds to prevent stalling and transmission/converter damage.

Fitment:
Chevrolet C1500 Base 1994
Chevrolet C1500 Base 1995
Chevrolet C1500 Base 1996
Chevrolet C1500 Base 1997
Chevrolet C1500 Cheyenne 1994
Chevrolet C1500 Cheyenne 1995
Chevrolet C1500 Cheyenne 1996
Chevrolet C1500 Cheyenne 1997
Chevrolet C1500 Cheyenne 1998
Chevrolet C1500 Silverado 1994
Chevrolet C1500 Silverado 1995
Chevrolet C1500 Silverado 1996
Chevrolet C1500 Silverado 1997
Chevrolet C1500 Silverado 1998
Chevrolet C1500 WT 1994
Chevrolet C1500 WT 1995
Chevrolet C1500 WT 1996
Chevrolet C1500 WT 1997
Chevrolet C1500 WT 1998
Chevrolet C2500 Base 1994
Chevrolet C2500 Base 1995
Chevrolet C2500 Base 1996
Chevrolet C2500 Base 1997
Chevrolet C2500 Base 1999
Chevrolet C2500 Base 2000
Chevrolet C2500 Cheyenne 1992
Chevrolet C2500 Cheyenne 1993
Chevrolet C2500 Cheyenne 1994
Chevrolet C2500 Cheyenne 1995
Chevrolet C2500 Cheyenne 1996
Chevrolet C2500 Cheyenne 1997
Chevrolet C2500 Cheyenne 1998
Chevrolet C2500 LS 1999
Chevrolet C2500 LS 2000
Chevrolet C2500 Silverado 1992
Chevrolet C2500 Silverado 1993
Chevrolet C2500 Silverado 1994
Chevrolet C2500 Silverado 1995
Chevrolet C2500 Silverado 1996
Chevrolet C2500 Silverado 1997
Chevrolet C2500 Silverado 1998
Chevrolet C2500 WT 1994
Chevrolet C2500 WT 1995
Chevrolet C2500 WT 1998
Chevrolet C3500 Base 1994
Chevrolet C3500 Base 1995
Chevrolet C3500 Base 1996
Chevrolet C3500 Base 1997
Chevrolet C3500 Base 1999
Chevrolet C3500 Base 2000
Chevrolet C3500 Cheyenne 1992
Chevrolet C3500 Cheyenne 1993
Chevrolet C3500 Cheyenne 1994
Chevrolet C3500 Cheyenne 1995
Chevrolet C3500 Cheyenne 1996
Chevrolet C3500 Cheyenne 1997
Chevrolet C3500 Cheyenne 1998
Chevrolet C3500 LS 1999
Chevrolet C3500 LS 2000
Chevrolet C3500 Scottsdale 1992
Chevrolet C3500 Silverado 1992
Chevrolet C3500 Silverado 1993
Chevrolet C3500 Silverado 1994
Chevrolet C3500 Silverado 1995
Chevrolet C3500 Silverado 1996
Chevrolet C3500 Silverado 1997
Chevrolet C3500 Silverado 1998
Chevrolet K1500 Base 1994
Chevrolet K1500 Base 1995
Chevrolet K1500 Base 1996
Chevrolet K1500 Base 1997
Chevrolet K1500 Cheyenne 1994
Chevrolet K1500 Cheyenne 1995
Chevrolet K1500 Cheyenne 1996
Chevrolet K1500 Cheyenne 1997
Chevrolet K1500 Cheyenne 1998
Chevrolet K1500 Silverado 1994
Chevrolet K1500 Silverado 1995
Chevrolet K1500 Silverado 1996
Chevrolet K1500 Silverado 1997
Chevrolet K1500 Silverado 1998
Chevrolet K1500 WT 1994
Chevrolet K1500 WT 1995
Chevrolet K1500 WT 1996
Chevrolet K1500 WT 1997
Chevrolet K1500 WT 1998
Chevrolet K2500 Base 1994
Chevrolet K2500 Base 1995
Chevrolet K2500 Base 1996
Chevrolet K2500 Base 1997
Chevrolet K2500 Base 1999
Chevrolet K2500 Base 2000
Chevrolet K2500 Cheyenne 1992
Chevrolet K2500 Cheyenne 1993
Chevrolet K2500 Cheyenne 1994
Chevrolet K2500 Cheyenne 1995
Chevrolet K2500 Cheyenne 1996
Chevrolet K2500 Cheyenne 1997
Chevrolet K2500 Cheyenne 1998
Chevrolet K2500 LS 1999
Chevrolet K2500 LS 2000
Chevrolet K2500 Silverado 1992
Chevrolet K2500 Silverado 1993
Chevrolet K2500 Silverado 1994
Chevrolet K2500 Silverado 1995
Chevrolet K2500 Silverado 1996
Chevrolet K2500 Silverado 1997
Chevrolet K2500 Silverado 1998
Chevrolet K2500 WT 1994
Chevrolet K2500 WT 1995
Chevrolet K2500 WT 1998
Chevrolet K3500 Base 1994
Chevrolet K3500 Base 1995
Chevrolet K3500 Base 1996
Chevrolet K3500 Base 1997
Chevrolet K3500 Base 1999
Chevrolet K3500 Base 2000
Chevrolet K3500 Cheyenne 1992
Chevrolet K3500 Cheyenne 1993
Chevrolet K3500 Cheyenne 1994
Chevrolet K3500 Cheyenne 1995
Chevrolet K3500 Cheyenne 1996
Chevrolet K3500 Cheyenne 1997
Chevrolet K3500 Cheyenne 1998
Chevrolet K3500 LS 1999
Chevrolet K3500 LS 2000
Chevrolet K3500 Scottsdale 1992
Chevrolet K3500 Silverado 1992
Chevrolet K3500 Silverado 1993
Chevrolet K3500 Silverado 1994
Chevrolet K3500 Silverado 1995
Chevrolet K3500 Silverado 1996
Chevrolet K3500 Silverado 1997
Chevrolet K3500 Silverado 1998
Dodge B1500 Base 1998
Dodge B250 Base 1994
Dodge B2500 Base 1995
Dodge B2500 Base 1996
Dodge B2500 Base 1997
Dodge B2500 Base 1998
Dodge B350 Base 1994
Dodge B3500 Base 1995
Dodge B3500 Base 1996
Dodge B3500 Base 1997
Dodge B3500 Base 1998
Dodge Dakota R/T 1998
Dodge Dakota R/T 1999
Dodge Dakota R/T 2000
Dodge Dakota R/T 2001
Dodge Dakota R/T 2002
Dodge Dakota R/T 2003
Dodge Dakota SLT 2000
Dodge Dakota SLT 2001
Dodge Dakota SLT 2002
Dodge Dakota SLT 2003
Dodge Dakota Sport 2000
Dodge Dakota Sport 2001
Dodge Dakota Sport 2002
Dodge Dakota Sport 2003
Dodge Durango Base 1998
Dodge Durango Base 1999
Dodge Durango Base 2000
Dodge Durango Base 2001
Dodge Durango R/T 2000
Dodge Durango R/T 2001
Dodge Durango R/T 2002
Dodge Durango R/T 2003
Dodge Durango SLT 1998
Dodge Durango SLT 1999
Dodge Durango SLT 2000
Dodge Durango SLT 2001
Dodge Durango SLT 2002
Dodge Durango SLT 2003
Dodge Durango SLT Plus 1999
Dodge Durango SLT Plus 2000
Dodge Durango SLT Plus 2002
Dodge Durango SLT Plus 2003
Dodge Durango Sport 2000
Dodge Durango Sport 2002
Dodge Durango Sport 2003
Dodge Durango SXT 2003
Dodge Ram 1500 Base 1994
Dodge Ram 1500 Base 1995
Dodge Ram 1500 Base 1996
Dodge Ram 1500 Laramie 1997
Dodge Ram 1500 Laramie 1998
Dodge Ram 1500 Laramie 1999
Dodge Ram 1500 Laramie 2000
Dodge Ram 1500 Laramie 2001
Dodge Ram 1500 Laramie 2003
Dodge Ram 1500 LT 1997
Dodge Ram 1500 SLT 2002
Dodge Ram 1500 SLT 2003
Dodge Ram 1500 Sport 1997
Dodge Ram 1500 Sport 1998
Dodge Ram 1500 Sport 1999
Dodge Ram 1500 Sport 2000
Dodge Ram 1500 Sport 2001
Dodge Ram 1500 SS/T 5.9L 1997
Dodge Ram 1500 SS/T 5.9L 1998
Dodge Ram 1500 ST 1997
Dodge Ram 1500 ST 1998
Dodge Ram 1500 ST 1999
Dodge Ram 1500 ST 2000
Dodge Ram 1500 ST 2001
Dodge Ram 1500 ST 2002
Dodge Ram 1500 ST 2003
Dodge Ram 1500 Van Base 1999
Dodge Ram 1500 Van Base 2000
Dodge Ram 1500 Van Base 2001
Dodge Ram 1500 Van Base 2002
Dodge Ram 1500 Van Base 2003
Dodge Ram 2500 Base 1994
Dodge Ram 2500 Base 1995
Dodge Ram 2500 Base 1996
Dodge Ram 2500 Base 1997
Dodge Ram 2500 Base 1998
Dodge Ram 2500 Base 1999
Dodge Ram 2500 Base 2000
Dodge Ram 2500 Base 2001
Dodge Ram 2500 Base 2002
Dodge Ram 2500 Laramie 2003
Dodge Ram 2500 Laramie 2005
Dodge Ram 2500 SLT 2003
Dodge Ram 2500 SLT 2004
Dodge Ram 2500 SLT 2005
Dodge Ram 2500 ST 2003
Dodge Ram 2500 ST 2004
Dodge Ram 2500 ST 2005
Dodge Ram 2500 Van Base 1999
Dodge Ram 2500 Van Base 2000
Dodge Ram 2500 Van Base 2001
Dodge Ram 2500 Van Base 2002
Dodge Ram 2500 Van Base 2003
Dodge Ram 3500 Base 1994
Dodge Ram 3500 Base 1995
Dodge Ram 3500 Base 1996
Dodge Ram 3500 Base 1997
Dodge Ram 3500 Base 1998
Dodge Ram 3500 Base 1999
Dodge Ram 3500 Base 2000
Dodge Ram 3500 Base 2001
Dodge Ram 3500 Base 2002
Dodge Ram 3500 Laramie 2003
Dodge Ram 3500 Laramie 2004
Dodge Ram 3500 Laramie 2005
Dodge Ram 3500 SLT 2003
Dodge Ram 3500 SLT 2004
Dodge Ram 3500 SLT 2005
Dodge Ram 3500 ST 2003
Dodge Ram 3500 ST 2004
Dodge Ram 3500 ST 2005
Dodge Ram 3500 Van Base 1999
Dodge Ram 3500 Van Base 2000
Dodge Ram 3500 Van Base 2001
Dodge Ram 3500 Van Base 2002
Dodge Ram 3500 Van Base 2003
Ford F-250 Base 1997
Ford F-250 Custom 1988
Ford F-250 Custom 1989
Ford F-250 Custom 1990
Ford F-250 Custom 1991
Ford F-250 Custom 1992
Ford F-250 Eddie Bauer 1995
Ford F-250 Eddie Bauer 1996
Ford F-250 HD XL 1997
Ford F-250 HD XLT 1997
Ford F-250 Lariat 1997
Ford F-250 Special 1995
Ford F-250 Special 1996
Ford F-250 Super Duty Lariat 1999
Ford F-250 Super Duty Lariat 2000
Ford F-250 Super Duty Lariat 2001
Ford F-250 Super Duty Lariat 2002
Ford F-250 Super Duty Lariat 2003
Ford F-250 Super Duty XL 1999
Ford F-250 Super Duty XL 2000
Ford F-250 Super Duty XL 2001
Ford F-250 Super Duty XL 2002
Ford F-250 Super Duty XL 2003
Ford F-250 Super Duty XLT 1999
Ford F-250 Super Duty XLT 2000
Ford F-250 Super Duty XLT 2001
Ford F-250 Super Duty XLT 2002
Ford F-250 Super Duty XLT 2003
Ford F-250 XL 1988
Ford F-250 XL 1989
Ford F-250 XL 1990
Ford F-250 XL 1991
Ford F-250 XL 1992
Ford F-250 XL 1993
Ford F-250 XL 1994
Ford F-250 XL 1995
Ford F-250 XL 1996
Ford F-250 XL 1997
Ford F-250 XLT 1993
Ford F-250 XLT 1994
Ford F-250 XLT 1995
Ford F-250 XLT 1996
Ford F-250 XLT 1997
Ford F-250 XLT Lariat 1988
Ford F-250 XLT Lariat 1989
Ford F-250 XLT Lariat 1990
Ford F-250 XLT Lariat 1991
Ford F-250 XLT Lariat 1992
Ford F-350 Base 1997
Ford F-350 Custom 1988
Ford F-350 Custom 1989
Ford F-350 Custom 1990
Ford F-350 Custom 1991
Ford F-350 Custom 1992
Ford F-350 Eddie Bauer 1995
Ford F-350 Special 1995
Ford F-350 Special 1996
Ford F-350 Super Duty King Ranch 2003
Ford F-350 Super Duty Lariat 1999
Ford F-350 Super Duty Lariat 2000
Ford F-350 Super Duty Lariat 2001
Ford F-350 Super Duty Lariat 2002
Ford F-350 Super Duty Lariat 2003
Ford F-350 Super Duty XL 1999
Ford F-350 Super Duty XL 2000
Ford F-350 Super Duty XL 2001
Ford F-350 Super Duty XL 2002
Ford F-350 Super Duty XL 2003
Ford F-350 Super Duty XLT 1999
Ford F-350 Super Duty XLT 2000
Ford F-350 Super Duty XLT 2001
Ford F-350 Super Duty XLT 2002
Ford F-350 Super Duty XLT 2003
Ford F-350 XL 1988
Ford F-350 XL 1989
Ford F-350 XL 1990
Ford F-350 XL 1991
Ford F-350 XL 1992
Ford F-350 XL 1993
Ford F-350 XL 1994
Ford F-350 XL 1995
Ford F-350 XL 1996
Ford F-350 XL 1997
Ford F-350 XLT 1993
Ford F-350 XLT 1994
Ford F-350 XLT 1995
Ford F-350 XLT 1996
Ford F-350 XLT 1997
Ford F-350 XLT Lariat 1988
Ford F-350 XLT Lariat 1989
Ford F-350 XLT Lariat 1990
Ford F-350 XLT Lariat 1991
Ford F-350 XLT Lariat 1992
GMC C1500 Sierra GT 1997
GMC C1500 Sierra SL 1994
GMC C1500 Sierra SL 1995
GMC C1500 Sierra SL 1996
GMC C1500 Sierra SL 1997
GMC C1500 Sierra SLE 1994
GMC C1500 Sierra SLE 1995
GMC C1500 Sierra SLE 1996
GMC C1500 Sierra SLE 1997
GMC C1500 Sierra SLT 1994
GMC C1500 Sierra SLT 1995
GMC C1500 Sierra SLT 1996
GMC C1500 Sierra SLT 1997
GMC C1500 Sierra Special 1994
GMC C1500 Sierra Special 1995
GMC C1500 Sierra Special 1996
GMC C1500 Sierra Special 1997
GMC C2500 Sierra 1992
GMC C2500 Sierra 1993
GMC C2500 Sierra SL 1994
GMC C2500 Sierra SL 1995
GMC C2500 Sierra SL 1996
GMC C2500 Sierra SL 1997
GMC C2500 Sierra SL 1998
GMC C2500 Sierra SL 1999
GMC C2500 Sierra SL 2000
GMC C2500 Sierra SLE 1992
GMC C2500 Sierra SLE 1993
GMC C2500 Sierra SLE 1994
GMC C2500 Sierra SLE 1995
GMC C2500 Sierra SLE 1996
GMC C2500 Sierra SLE 1997
GMC C2500 Sierra SLE 1998
GMC C2500 Sierra SLE 1999
GMC C2500 Sierra SLE 2000
GMC C2500 Sierra SLT 1994
GMC C2500 Sierra SLT 1995
GMC C2500 Sierra SLT 1996
GMC C2500 Sierra SLT 1997
GMC C2500 Sierra SLT 1998
GMC C2500 Sierra SLT 1999
GMC C2500 Sierra SLT 2000
GMC C2500 Sierra SLX 1992
GMC C2500 Sierra SLX 1993
GMC C3500 Sierra 1992
GMC C3500 Sierra 1993
GMC C3500 Sierra SL 1994
GMC C3500 Sierra SL 1995
GMC C3500 Sierra SL 1996
GMC C3500 Sierra SL 1997
GMC C3500 Sierra SL 1998
GMC C3500 Sierra SL 1999
GMC C3500 Sierra SL 2000
GMC C3500 Sierra SLE 1992
GMC C3500 Sierra SLE 1993
GMC C3500 Sierra SLE 1994
GMC C3500 Sierra SLE 1995
GMC C3500 Sierra SLE 1996
GMC C3500 Sierra SLE 1997
GMC C3500 Sierra SLE 1998
GMC C3500 Sierra SLE 1999
GMC C3500 Sierra SLE 2000
GMC C3500 Sierra SLT 1994
GMC C3500 Sierra SLT 1995
GMC C3500 Sierra SLT 1996
GMC C3500 Sierra SLT 1997
GMC C3500 Sierra SLT 1998
GMC C3500 Sierra SLT 1999
GMC C3500 Sierra SLT 2000
GMC C3500 Sierra SLX 1992
GMC C3500 Sierra SLX 1993
GMC K1500 Sierra SL 1994
GMC K1500 Sierra SL 1995
GMC K1500 Sierra SL 1996
GMC K1500 Sierra SL 1997
GMC K1500 Sierra SL 1998
GMC K1500 Sierra SLE 1994
GMC K1500 Sierra SLE 1995
GMC K1500 Sierra SLE 1996
GMC K1500 Sierra SLE 1997
GMC K1500 Sierra SLE 1998
GMC K1500 Sierra SLS 1995
GMC K1500 Sierra SLT 1994
GMC K1500 Sierra SLT 1995
GMC K1500 Sierra SLT 1996
GMC K1500 Sierra SLT 1997
GMC K1500 Sierra SLT 1998
GMC K1500 Sierra Special 1994
GMC K1500 Sierra Special 1995
GMC K1500 Sierra Special 1996
GMC K1500 Sierra Special 1997
GMC K1500 Sierra Special 1998
GMC K2500 Sierra 1992
GMC K2500 Sierra 1993
GMC K2500 Sierra SL 1994
GMC K2500 Sierra SL 1995
GMC K2500 Sierra SL 1996
GMC K2500 Sierra SL 1997
GMC K2500 Sierra SL 1998
GMC K2500 Sierra SL 1999
GMC K2500 Sierra SL 2000
GMC K2500 Sierra SLE 1992
GMC K2500 Sierra SLE 1993
GMC K2500 Sierra SLE 1994
GMC K2500 Sierra SLE 1995
GMC K2500 Sierra SLE 1996
GMC K2500 Sierra SLE 1997
GMC K2500 Sierra SLE 1998
GMC K2500 Sierra SLE 1999
GMC K2500 Sierra SLE 2000
GMC K2500 Sierra SLT 1994
GMC K2500 Sierra SLT 1995
GMC K2500 Sierra SLT 1996
GMC K2500 Sierra SLT 1997
GMC K2500 Sierra SLT 1998
GMC K2500 Sierra SLT 1999
GMC K2500 Sierra SLT 2000
GMC K2500 Sierra SLX 1992
GMC K2500 Sierra SLX 1993
GMC K3500 Sierra 1992
GMC K3500 Sierra 1993
GMC K3500 Sierra SL 1994
GMC K3500 Sierra SL 1995
GMC K3500 Sierra SL 1996
GMC K3500 Sierra SL 1997
GMC K3500 Sierra SL 1998
GMC K3500 Sierra SL 1999
GMC K3500 Sierra SL 2000
GMC K3500 Sierra SLE 1992
GMC K3500 Sierra SLE 1993
GMC K3500 Sierra SLE 1994
GMC K3500 Sierra SLE 1995
GMC K3500 Sierra SLE 1996
GMC K3500 Sierra SLE 1997
GMC K3500 Sierra SLE 1998
GMC K3500 Sierra SLE 1999
GMC K3500 Sierra SLE 2000
GMC K3500 Sierra SLT 1994
GMC K3500 Sierra SLT 1995
GMC K3500 Sierra SLT 1996
GMC K3500 Sierra SLT 1997
GMC K3500 Sierra SLT 1998
GMC K3500 Sierra SLT 1999
GMC K3500 Sierra SLT 2000
GMC K3500 Sierra SLX 1992
GMC K3500 Sierra SLX 1993