A while back, I bought a used 8" center section for my King Cobra. Now that the engine is done and I'm putting everything back together, I dragged it out to look it over. It has Richmond 3.80 gears, and an Auburn Pro differential. It looks good, but I know very little about them, so I'm wondering if anyone can offer advice on what to look for? I know that the Auburn diffs have clutches in them, but how do you tell if they're still in good shape, other than to install and light 'em up?