Trans fluid? Yes. You talking transmission or you mean the Transfer case fluids? I "sloppily" referred to the Transfer Case as the t-case. My bad. For the fluids I would do all 3 underneath and go to all synthetics ( F + R diff, plus Transfer Case ) :iagree:100%
I thought the transmission fluid on the 4th gen was a sealed system, w/ no maintenance. ? Not sealed. Stupid fill/level check methodology, that's all. Toyota recommends servicing based on 'inspection' (whatever that means) OR if you tow they say 60k. IMHO if you city drive, tow, 4wheel etc it's worth doing at 60k. The 2 links below will shed more light.