I have had problems with my 4wd, in process of changing the encoder motor noticed fluid inside the encoder motor. I am thinking I need to replace the bearing/seal on the transfer case, however I am unsure of the part number(s) I should be ordering. I know that I have the 246 autotrac transfer case, however I am not sure if this is different from the NV246. I also notice there is red fluid in my transfer case when I thought there was supposed to be blue fluid since it is the autotrac. What GM part numbers do I need to order for the bearing and seal and should this transfer case have the blue fluid instead of red?