Abstract: A seal installation tool is provided which comprises a yoke having a curved, lower camming surfaces and a handle, an apertured block rotatably secured within the yoke and a collar piece which is separate from the handle and the block. The apertures of the collar and the block are sized to slidingly receive a shift linkage piece extending from a transmission casing. The block is further provided with a set screw for securing the block to the linkage piece. A hole through an arm of the yoke provides access to the head of the set screw.