2002 E-350 7.3t - recently when starting the engine (hot) I get a loud, rapid clicking sound, as if the starter isn't fully engaging. The truck still starts fine & doesn't make the sound when starting from cold. Sound appears to come from the left front but I could be imagining that.

I'm assuming it's a starter issue - thoughts? If so are there any walk-thrus for starter replacement? Didn't find any on search.