Used Ford Sierra Differential

The Ford Sierra ran from 1982 to 1993 in one generation, with a significant facelift in 1987 that updated the body and some mechanical components. The differential is primarily matched to engine code and gearbox type, so whether a pre-1987 unit crosses cleanly to a post-1987 car is something you should confirm with the breaker against your registration, as mounting or ratio details may differ across that boundary. Supply your engine code from the V5 or a VIN check and the breaker can tell you straight away.

Engine displacement alone does not tell the full story — what matters most is the engine code, which determines the drivetrain specification including differential ratios. A 2.0 and a 1.6 Sierra are likely to use different ratio differentials suited to their respective outputs, so you should not assume they interchange. Get your engine code from your V5 and quote it to the breaker so they can match the correct unit.

Trim level does not affect differential fitment on the Sierra — GL and Ghia are cosmetic and comfort-spec differences covering interior, badging and minor equipment, not drivetrain changes. What matters is your engine code, fuel type and gearbox type, so a Ghia-badged car with the same engine and gearbox as a GL Sierra would take the same differential. The breaker will confirm the correct unit from your registration or engine code rather than your trim badge.

The XR4i used a 2.8 V6 engine and was a performance variant, so on the surface the engine family is shared with some other 2.8 Sierras, but the XR4i had a specific drivetrain setup including its own differential specification to suit its performance tuning. Whether the differential crosses to another 2.8 Sierra depends on the exact engine codes and gearbox types involved, so route this question to the breaker with both vehicles' registrations or engine codes to get a reliable answer.

The Sierra RS Cosworth and RS500 used a substantially uprated drivetrain built to handle significantly more power and torque than the standard Sierra range, and the differential on those cars is not a straightforward swap into a mainstream Sierra. Physically fitting a Cosworth differential into a standard Sierra body is something some owners pursue, but compatibility with your existing driveshafts, subframe and axle is something to discuss directly with a specialist breaker rather than assume. Quote both vehicles' engine codes and the breaker can advise on what modifications or matching parts you would need.

A 1985 car sits before the 1987 facelift and a 1989 car sits after it, which means you are crossing a notable production boundary where some mechanical specifications changed. The differential match depends above all on your engine code and gearbox type on both vehicles, but whether the specific ratios and any mounting details align across the 1987 facelift line is something you should confirm with the breaker rather than assume. Give the breaker both engine codes and both registrations and they will tell you whether the units are interchangeable.