Second Hand Ford Sierra Transfer Box

Only a small number of Ford Sierras were fitted with a transfer box — specifically the rare Sierra XR 4x4 and the Sierra Cosworth 4x4 variants, which used a four-wheel-drive system requiring a transfer box to split drive between the front and rear axles. The vast majority of Sierras were rear-wheel-drive and never had a transfer box at all. If your Sierra is a standard rear-wheel-drive model, the part you may be looking for is more likely a gearbox, differential, or propshaft rather than a transfer box.

The transfer box was fitted to four-wheel-drive Sierra variants only — principally the Sierra XR 4x4 (introduced in the mid-1980s) and the Sierra Cosworth 4x4 (from 1990 onwards into the final years of Sierra production, which ended in 1993). These are relatively rare vehicles on UK roads today, so genuine used transfer boxes for them are scarce; confirm with the breaker that the unit they have came from a confirmed 4WD Sierra rather than another Ford application.

The Sierra XR 4x4 and the Sierra Cosworth 4x4 are different vehicles with different drivetrains, engines, and outputs, so the transfer box from one is not a straightforward swap into the other. The Cosworth 4x4's drivetrain was developed to handle significantly more torque than the XR 4x4 unit, meaning internal ratings and mountings may differ. You should confirm the exact part against your registration number with the breaker before purchasing, as cross-referencing by engine code is the most reliable approach here.

Trim level does not affect transfer box fitment — the transfer box is a mechanical drivetrain component determined by the four-wheel-drive system and engine specification, not by whether the car was badged Ghia, XR, or any other trim designation. What matters is the engine code and the specific 4WD drivetrain variant, both of which your breaker can cross-reference against your registration or V5. You may find cosmetic or interior differences between trim levels of the same 4x4 model, but these have no bearing on whether the transfer box will interchange.

The most important detail to supply is your engine code, which is listed on your V5 logbook or can be obtained via a VIN check — this tells the breaker exactly which drivetrain variant your Sierra has, which is far more useful than the year or badge alone. You should also confirm the gearbox type, as the transfer box connects directly to it and compatibility depends on that interface. Ancillary fittings and mounting bracket details can vary and are best confirmed directly with the breaker against your specific registration number rather than assumed from the year alone.