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high pressure
Part Number: 817568
so no modifications necessary to install them correctly
OEM - 15749766
1977-1978 GMC K35
B&M TRANSMISSION SPEEDOMETER PORT PLUG - 20301 exhaust-system high pressureOverview: B&M Racing & Performance brings you this billet aluminum speedometer port block off plug that fits GM TH400 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
