Sliders and slider assemblies can be reused if you plan to use your own core to install the A-5 gear kit and components. Make sure you check the internal splines, as they should come to a house-shaped point and not be rounded over. Another important thing to check on the First/Second slider is that the Reverse gear does not have any pitting on the engagement side. The Reverse gear is located on the outside of the First/Second slider and is the gear that has straight-cut teeth. As you can see from the picture, the First/Second slider teeth in our core were rounded pretty well, and it was replaced with a new one. Keep in mind that the First/Second slider is not sold with the hub, synchronizer keys, or springs. Astro also notes that you should never remove the First/Second hub, which is pressed on to the mainshaft, as it is virtually impossible to get it pressed back on successfully.