Extra maintenence for 4x4?

[Maxil]

Just trying to figure up any and all extra expenses before I get into a 4x4. I will probably end up with a 98' or 99' SR5. My main question is what extra regular maintenence do these require over a 4x2 and how much does it cost? If something is not too difficult I will probably do it myself.

Thanks much,
Maxil

 

[JeremyH]

Drain and fill one extra differential as well as the transfercase. Nothing too difficult and doesnt require any special tools.