After blowing up my trandfer case i jist got it replaced today. Everything went back togetger smoothly so i went to go test it oit but appeared only the nack tires were spinning.

I got her jacked up and both drive shafts were spinning so I figured the front differential gears were trashed. Popped the differential cover off and all the gears seemed to be in good shape but I'm no expert on differentials. The main gear was spinning but nothing to the axles. Any insight on why it's not working? I'm hoping it's something simple

 

You didn't hook up the vacuum lines to the switch on the T-case, for the vacuum operated central axle disconnect. Have a look here to see how things are supposed to work.

Welcome to DF!