Chevrolet Repair: 79 chevy k5 blazer tc fluid, chevy k5 blazer, transfer case

Question
what kind of fluid goes in the transfer case of a 79 k5 blazer full time 4wd i think it has low lock,low,neutral,high,high lock its made of cast iron and very heavy


Answer
You better check that because I have checked three books and I see everything from ATF.  I will try and continue to find out for you. Do you know what transfer case it is? to 50w

Wayne
Sorry for the delay my dad had a bypass surgery on Tuesday and I am just getting to these messages now.