I was told this a few years ago from my trans man. He said that anyone useing a cable shifter should make sure the engine is grounded properly. He told me depending on what the cable and outer cable sheath is made of if both are metal a poor ground between the engine and the chassis would cause the shifter cable and sheath to become the ground and weld itself together. Besides it wouldn't hurt to have a really good engine to chassis ground anyway. "Doc"