Also known as: d16, d-20, d20, d24, daewoo manual, gmdat manual
Daewoo's five-speed manual transaxles — the D16, D-20 and D24 — in the Lanos, Nubira and the cars that became Chevrolets.
⚑ The number is the engine size these were rated for, not the gearbox's own dimension — a D16 sits behind a 1.6 — which is why the codes look like engine codes and why parts searches on them return engines.
Daewoo's own engineering descends from Opel's, and the Lanos and Nubira were built on Opel platforms. The F-series Opel gearboxes are the close relatives, and their material is far more plentiful.
After 2002 these became GM Daewoo (GMDAT) units and then simply GM's, so the same gearbox is documented under three companies' names depending on the year — which is the practical difficulty rather than anything mechanical.
They are unremarkable and reasonably durable; the complaints are the ordinary ones of a cable-shifted transaxle — linkage wear read as synchroniser wear.
Cars fitted with this gearbox
3 generations. Only where a source names the model and the generation together — a gearbox is documented as a product far more often than as a fitment, so this list is deliberately shorter than the truth.
Chevrolet
Daewoo
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about D16 / D-20 / D24.