[Nick_R_23]

Just replace the whole thing, regardless of shaft play. Ignition modules can fail with age, pickup coils can crack, wear, or have issues with the magnetic portion. You can buy pickup coils and ignition modules, but by the time you add in a new cap and rotor (which you haven’t said if they were replaced or not), you’re at the cost of an entire new unit with a warranty. Aside from the ECM, the distributor provides the most control over the engine on these trucks.