Reconditioned Volkswagen Transporter 2.4 D Gearbox

2.4 D Transporter from 1990 to 2003: AAB or AJA – is the gearbox the same?

No, the engine codes AAB and AJA do not automatically correspond to the same gearbox, even though both power the T4 with the same 2.4 D unit. The engine code, stamped on the block, directly determines which gearbox reference to order.

What the gearbox references on this T4 generation actually mean

The Transporter T4 2.4 D is paired in every case with a 5-speed manual, but the gearbox references listed – DKA, ARL, AYD, CRN, CRL, CLZ, CHS, CCY, AYF – are not interchangeable. Several families coexisted across the 1990–2003 production run, and an early-build Transporter does not necessarily carry the same unit as a late-production T4. The engine code is the essential starting point; the gearbox number stamped on the casing then confirms the exact family.

Known weaknesses of the 2.4 D in heavy commercial use

The 2.4 D is a robust unit, but the Transporter's typical usage profile – heavy loads, frequent cold starts, long distances – places particular strain on the 1st and 2nd gear synchromesh rings and the gearbox bearings. The most common early warning signs are difficulty engaging 1st gear from cold and bearing noise at a steady engine speed. Two reconditioning options are available depending on the condition of the original unit.