Bulkhead Workshop › Land Rover models › Range Rover P38 2.5 DSE diesel (BMW) › Workshop guide › Borg Warner transfer box & viscous coupling check

Range Rover P38 2.5 DSE diesel (BMW): borg warner transfer box & viscous coupling check

Transmission · Range Rover P38 (1994–2002) · 1994–2002

How often: every 24,000 mi or 2 yrs, whichever comes first. The chain stretches and the viscous coupling can seize. A seized coupling winds up the driveline on tight turns and wears tyres and the box itself.

Work safely: support the vehicle on axle stands, never a jack alone; let it cool first. Check figures against your workshop manual. You do this work at your own risk.

Parts

• Transfer box fluid (Borg Warner 44-62 chain-drive box with viscous coupling, ≈2.3 L: use the fluid in your handbook (it is not the LT230 oil))

Tools

• Jack
• Axle stand
• Drain tray

Step by step

1. Change the transfer box fluid with the specified fluid only (Borg Warner boxes do not take LT230 gear oil).
2. Viscous coupling test: on level ground, jack one wheel clear, engine off, in neutral. Turn the raised wheel by hand with a long bar or a helper. A healthy coupling lets it turn steadily against some resistance; if it locks solid, the coupling is seizing.
3. On a drive, slow tight turns on tarmac should feel smooth. Crabbing, tyre scrub or a clunk on full lock point to the coupling.

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