B&M Shift Improver Kit - GM TH400/475 Transmissions HAT road debris

road debris

Standard mounting patterns on the throttle body flange with a 93mm flange opening include GT350

We found gains when installing these on late model applications

Easy bolt-on installation Increased ground clearance Levels the front with the rear of the vehicle

LLY Duramax High Pressure Injection Line (Number 2 and Number 7)

B&M Shift Improver Kit - GM TH400/475 Transmissions HAT road debrisThe B&M Shift Improver kits feature two options to recalibrating your 1988 1994 GM TH400 and TH475 automatic transmissions. First is the HEAVY DUTY set up, giving you firm positive shifts without loss of driver comfort for improved performance in all street vehicles. This is a great option for performance street driving or towing. The second is our STREET STRIP set up. Be warned, this will deliver firm positive shifts you will feel, along with easily