Quote:
Originally Posted by Sgb020
Today I hit 29k thousand miles on my 4Runner. I decided to change my rear diff fluid at 29k miles. My 21 Tacoma rear diff went out at 8k so I decided to change my 4Runner as a precaution. My question is should I wait until 50k to change the transfer case and front diff since I hardly put it in 4 wheel drive? I used 75w90 gl5. 
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Yes. I go 50K on both differentials and transfer case using Mobil Delvac Synthetic 75w90. 306K miles on the truck.
