terribletaco

I have an 01' Tacoma 4x4. It is a 5 speed. Sometimes when I pull off from a dead stop in first gear I hear this popping noise. I checked the universal joints and they seem to be fine, but I could hear the popping from the t-case and the rear end while I was under the truck and spinning the driveshaft. Both places sound similar. Should I have some slack? The truck has 130k miles on it. Any help would be appreciated.