Citroen Aircross Differential Assembly

Because the differential is integrated into the gearbox on these cars, replacing it in practice means replacing or rebuilding the gearbox. Used South African gearboxes span a wide range depending on mileage and model, and on an older car that is usually the most economical route by some distance. We source them nationally and VIN-match on gearbox code and final drive ratio before shipping. Send the chassis number for current stock and pricing.

A whine that tracks road speed and does not change when you change gear points at the crown wheel and pinion bearings inside the gearbox — a well-documented complaint on these boxes as they age. Before assuming the worst, check the gearbox oil level, because a box run low will whine long before it fails and topping it up costs almost nothing. A worn input shaft bearing produces a similar noise but changes with gear selection, which is how you tell them apart.

On an integrated Citroen gearbox, a proper rebuild — new bearings, crown wheel, pinion and seals, all set up to the correct preload — costs about what a good used gearbox does, and the used box wins on labour hours. That is the usual recommendation. The calculation flips on rarer models where a used box is hard to find, or where the existing box is otherwise in excellent condition and only the bearings have gone. We will run both numbers rather than assume.

The manual gearbox oil, which is also the differential oil on these cars, is nominally lifetime-fill. In practice we recommend changing it every 60,000 to 80,000 km, and our conditions are the reason — heat degrades the additive package and any water or dust that finds its way past a seal stays in there indefinitely on a lifetime fill. It is an inexpensive service that measurably extends crown wheel and bearing life. Ask for it at the next major service.

We source them nationally, and in practice that means complete gearbox assemblies rather than bare differentials, since the two are one unit on these cars. The used pool is better than the local Citroen population would suggest because the gearboxes are shared with Peugeot. Send the VIN and the current mileage and we will quote same day, with the gearbox code confirmed so the final drive ratio matches your car.