What type of fluid and how do you service the transmission and transfer case of a 1997 4Runner 4 WD? Is there any service needed on other parts of this drive train? I tried to remove the alloy wheels today to check the brakes but the rims were stuck on the hubs? Do you heat the rims to get them off or just beat on them with a hammer on the inside until they come off? What do you coat them with to prevent this problem?

Auto transmission is dextron3 four liters drain and refill, transfercase is 75w90and beat the wheels off with a rubbue malot on the inside.