Abstract: A scribe tool includes an elongated horizontal support member with connector plates at each end adapted for attachment to the block end of a transmission housing. An elongated strap is pivotally connected to the center of the support member for pivotal movement through a vertical plane parallel to the support member. A scribe arm on the upper end of the strap includes a forward leg with a pointed lower end for scribing a material, and a rearward leg slidably journaled in a sleeve on the upper end of the strap to permit radial movement of the scribe arm relative to the pivotal axis of the strap, and also permit pivotal movement of the scribe arm with the strap. The sleeve has a truncated cylindrical aperture therethrough for receiving the base leg which matches the shape of the base leg, to prevent rotational movement of the base leg while permitting radial movement of the scribe arm.