hey all, i'm just stumbling upon your site.  i know a little about these trucks, having played with a 620 before and owned an '84 720 ST before, and now i find myself owning another...a 1985 KC ST 2wd with a 5-speed and the Z24.  my name is Josh and i'm a diesel mechanic by trade, originally from Alabama but i've been a little bit of everywhere as i did 7 years in the Army.  anyhow, i hope to get to know some of ya'll and maybe learn some things in the process...and of course help where i can. 

Welcome to the site!! You will find many answers here, and maybe make some friends too.