B&M Racing & Performance brings you this billet aluminum speedometer port block-off plug that fits Mopar TF-727, 36RH, 37RH, 46RH and 47RH transmissions. This plug is used to block the mechanical speedometer gear port when upgrading to an electronic speedometer and includes a replaceable Buna-N-rubber o-ring. It features a black Mil-Spec anodized finish for long lasting good looks, even in harsh conditions. Comes with hardware and instructions for a quick and easy installation.