Mazda 2002 B2300 Owner's Manual page 267

Checking and adding transfer case fluid (if equipped)
Vehicle must be on level surface.
1. Clean the filler plug.
2. Remove the filler plug and
inspect the fluid level.
3. Add only enough fluid through
the filler opening so that the
fluid level is at the bottom of
the opening.
Use only fluid that meets Mazda specifications. Refer to Lubricant
Specifications in this chapter.
DRIVELINE UNIVERSAL JOINT AND SLIP YOKE
Your vehicle may be equipped with universal joints that require
lubrication. If the original universal joints are replaced with universal
joints equipped with grease fittings, lubrication will also be necessary.
Maintenance and Specifications
267