Billet aluminum construction with engraved B&M logo. Protects your transmission from contaminants during use or storage. Replaceable O-ring seals to prevent leakage and easy maintenance Ideal for electronic speedometer conversions. Comes with stainless steel hardware for superior corrosion resistance.

B&M Racing & Performance brings you this billet aluminum speedometer port block-off plug to fit GM TH400 transmissions. This plug is used to block the mechanical speedometer gear port when upgrading to an electronic speedometer and comes with a replaceable Buna-N-Rubber O-ring. Black Mil-Spec anodized finish keeps it looking great even in the toughest conditions. Hardware and instructions included for quick and easy installation.


Manufacturer: ‎B&M Racing
Part number: ‎20301
Item weight: ‎113 g
Product size: ‎19.56 x 13.59 x 2.16 cm; 113.4 g
Material: ‎Aluminium Stainless Steel
Accessories: ‎B&M Racing 20301: Transmission Speedometer Port Plug, Gm400.
Batteries included: ‎No
Batteries used: ‎No
Product dimensions (Length x Width x Height): ‎19.6 x 13.6 x 2.2 cm