Wouldn't the KZ shift a little later being it is calibrated for 3.73's? It would require a faster output shaft speed to maintain the same speed as a BR with 3.42's. If the car has 3.42's the vehicle speed would have to be higher for the KZ to shift gears.The 442 (KZ-F code) trans will install just fine, but around town shifting will be very quick at 12, 18 and 24 mph, while the BR will be 14, 22, and 43 mph. It will 4-3 coast down at 20 mph beside 37 mph of the BR. Most other characteristics are very close.