B&M Shift Improver Kit - GM TH400/475 Transmissions HAT Standard mounting patterns on the

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

Common replacement on Duramax turbos

Also Fits Tahoe and Yukon

Upgrade your Jeep with Rough CountryΓÇÖs AL2 Steps and youΓÇÖll feel the difference every time you climb into the cab

B&M Shift Improver Kit - GM TH400/475 Transmissions HAT Standard mounting patterns on theThe 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