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Transfer Box Servicing
We carry out transfer box oil changes using the correct manufacturer-specified fluid for your specific transfer case — the grade varies significantly between vehicles and getting it wrong causes damage.
Why book with us
Transfer Box Servicing with clear advice.
The transfer box (transfer case) splits drive between front and rear axles on 4WD and AWD vehicles. Like differentials, it relies on gear oil for lubrication — and like differentials, it is rarely included in standard service schedules. Transfer box oil degrades through heat cycling, contamination with metal particles from normal wear, and moisture ingress. Old oil fails to protect the chain or gears and planetary sets inside the unit, leading to expensive wear.
Transfer box oil specification is vehicle-specific and the grades vary considerably. A Land Rover Defender, a BMW X5, and a Toyota Land Cruiser all take different fluids. Some transfer cases use ATF (automatic transmission fluid), others use specific gear oils, and some manufacturers have their own proprietary specification. We confirm the correct fluid from your vehicle identification number before starting the job — not from a generic application guide.
Common transfer boxes we service include: Land Rover LT230 and LT85 (Defender, Discovery, Range Rover Classic), BorgWarner and ZF transfer cases (BMW X-series, Mercedes ML/GL), Toyota Super Select (Land Cruiser, Hi-Lux, Prado), Mitsubishi Easy Select and Super Select (Shogun/Pajero, L200), and Nissan ATTESA (Patrol, Navara).
Fluid spec confirmed first
Transfer box fluid grade varies enormously between vehicles — we look up your specific unit before starting.
Land Rover transfer boxes
LT230 and later Land Rover transfer cases are a regular service item at our Brierley Hill workshop.
4WD capability preserved
Correct fluid keeps high/low range engagement and 4WD operation working as designed.
Transfer Box Servicing
Transfer box service includes
Clear expectations, no surprises. If anything extra is needed, we explain it first.
- Confirmation of correct fluid grade and fill quantity from vehicle identification.
- Transfer box drain and refill with manufacturer-specification oil.
- Inspection of transfer box breathers — blocked breathers pressurise the case and cause seal failure.
- Check for leaks at output seals before and after service.
- Post-service test for correct high/low range engagement where accessible.
Transfer Box Servicing
Common questions
- How often does a transfer box need servicing?
- Manufacturer intervals vary, but most 4WD transfer boxes benefit from an oil change every 30,000–60,000 miles. Land Rover specifies transfer box oil changes at regular intervals on Defender and Discovery. Off-road use, water crossings, and towing all accelerate oil degradation and shorten service intervals.
- What happens if transfer box oil is not changed?
- Degraded transfer box oil fails to protect the chain, gears, and bearings inside the unit. Symptoms of a failing transfer box include vibration when in 4WD, difficulty engaging high/low range, and eventually a grinding noise or total failure to engage 4WD. Transfer box replacement or rebuild is a significant cost — preventative oil changes are straightforward by comparison.
- Is a transfer box the same as a differential?
- No — they are different units. The transfer box splits drive between the front and rear axles. The differentials (front and rear) split drive between the left and right wheels on each axle. Each unit has its own oil, its own specification, and its own service interval. All three need attention on a 4WD vehicle.
From the blog
Helpful guides
Areas served
Serving drivers across the local area
We provide transfer box servicing for customers from across the region — book online or call us.
Experts in transfer box servicing
Tell us your car and symptoms, we will advise honestly.
Serving Brierley Hill and surrounding West Midlands areas towns. Message or call and we will outline likely costs before we book you in.