4 × 4 MAINTENANCE
In addition to a transmission, all 4 × 4 vehicles have a transfer case, locking
hubs, and front and rear differentials. Some have an additional center differential
that is part of the 4 × 4 drivetrain system. The maintenance of the transfer case is
usually the same as the standard transmission (check your owner’s manual just
to make sure). Maintenance of the locking hubs is extremely critical, however.
Locking hubs come in two forms: automatic and manual. Both forms of hubs
must be inspected for wear and disassembled, cleaned, and lubricated regularly
(every 24,000 miles or 24 months). Snow, ice, water, salt, and mud find their
way into these mechanized units and render them useless, costing the owner big
bucks. Do yourself a favor and keep the locking hubs in good working order.