Rockwell T221 Ran Dry

[Tito19]

(A little back story) So i finally get my 69 k20 running and DMV paper work done, I get over excited and forget to check the transfer case for gear oil and take her for a drive of about 2 miles. Today i go to change the T-case gear oil and nothing comes out.... i put my finger in the drain plug and feel that the gears are some what coated with oil but no real amount in the T-case. I fill her up and take her on the road (city/highway) as I'm getting on to the highway i hear a loud "clunk" I get her up to about 55mph then back home (total trip 6miles). So my question is how can i tell if my T-case wrecked or okay? Apologies for the long winded question but i thought it would.