Reconditioned Volkswagen Transporter Gearbox

Transporter T4 and T5: before 2009, the gearbox is usually the first to go — after 2009, it's the DSG that generates the most alerts

On the Transporter, transmission failures follow a clear generational pattern. The 5-speed manual gearboxes fitted to petrol T4s (engine codes AAF, ACU, AET, AEU on the 2.5) and diesels (AAB, AJA on the 2.4 D) suffer primarily from synchroniser wear, made worse by heavy use under load. On the diesel T5, the 1.9 TDI (AXB, AXC, BRR, BRS) and the 2.5 TDI (AXD, AXE, BNZ, BPC) share similar symptoms — stiff gear changes, grinding on downshifts — but their gearboxes are not interchangeable: depending on the year and variant, the 2.5 TDI can take either a 5- or 6-speed unit, whereas the 1.9 TDI is exclusively 5-speed.

T5 post-2009: the 2.0 TDI in manual or DSG — a choice that changes everything

From 2009 onwards, the T5 moved to the 2.0 TDI with eight distinct engine codes (CAAA, CAAB, CAAC, CFCA, CXFA, CXGA, CXHA, DJKA). This engine can be paired with a 5- or 6-speed manual gearbox, but also with a DSG 7. On the latter, mechatronic unit problems are well documented — slipping, juddering on pull-away, harsh gear changes — and are the primary reason for replacement on automatic Transporters of this generation. The DSG is offered here with a new dual-clutch, without mechatronic unit: if your mechatronic unit is faulty, that is a separate matter to address independently.

Petrol and mild-hybrid versions: 2.0, 2.5, 1.4 TSI and 2.0 TSI — significantly lower volumes

Petrol variants account for a minority of Transporters on the road. The 2.0 (AXA, CJKA) and the 2.5 petrol are fitted with 5-speed manual gearboxes; the 2.0 TSI (CJKB) takes a 6-speed manual, and the 1.4 TSI (same code CJKB) a DSG 7. Identifying the engine code is essential here: two different engines share the same CJKB code, and their respective gearboxes are not the same. The collection covers the entire period 1990–2019, on an exchange basis or as a rebuild of your own unit, subject to availability.