Does the GM 6T40 / 6T45 (AF40) automatic gearbox gearbox come with a warranty?

Yes. Every gearbox we supply carries a minimum 30-day warranty, some longer. The warranty period is always stated in the quote.

How fast is delivery?

Normal delivery time is 6–8 days from order confirmation. We deliver across Finland and the other Nordic countries.

Where do I find the gearbox code?

The gearbox code is stamped on the casing or on a label, and it is also in the manufacturer’s catalogue under your VIN. If you cannot find it, send us the VIN and we will look it up.

How do I know the gearbox fits my car?

The gearbox code decides it — the same three letters can be a different gearbox in a different model year. Send the code or the VIN and we check the fitment before quoting.

What does a used gearbox cost?

The price depends on condition and mileage. Ask for a free quote — we reply within 24 hours with availability and price.

GM 6T40 / 6T45 (AF40) automatic gearbox

Gearbox code	6T40 / 6T45 / AF40
Transmission	Automatic
Condition	Used / reconditioned

GM’s 6T40 family, also sold in Europe as the AF40, is a six-speed torque-converter automatic for transverse engines. It is used widely across mid-size Opel and Chevrolet models; the 6T30, 6T40 and 6T45 in the same family differ mainly in torque capacity.

Which cars does this gearbox fit?

Opel: Astra J, Insignia A, Mokka, Zafira C, Meriva B, Cascada

Chevrolet: Cruze, Orlando, Aveo, Trax, Captiva

Verified gearbox codes

According to the manufacturer’s parts catalogue these models were supplied with the following gearboxes. It shows which units can sit in the same car — and where this one fits in.

Opel Insignia A (2009-2017): 6T45 · 6T70 · AF40-6 · M32 Gen 1/2 · F40
Opel Astra H (2004-2014): AF40-6 · AF17 · AF22 · F13 · F17 · F23 · M20 · M32

Source: the manufacturer’s official parts catalogue (partslink24), checked in October 2026.

Units within the family are not interchangeable, so the exact type designation has to be given when ordering.

Typical failures

These are the reasons this gearbox usually gets replaced — check your own symptoms before ordering:

torque-converter lock-up clutch wear, vibration at steady speed
valve body wear — soft or delayed shifts
skipped oil services — the fluid needs changing about every 60,000 km

Matching engines from our stock

This gearbox is used with the following engine codes, which we also supply:

Z20DMH · B14NET · A17DTF

Where to find your gearbox code

The gearbox code is the decisive detail: the same gearbox model was built under several codes, and they differ in ratios and software. There are three places to find it: the type plate on the gearbox casing, the equipment sticker on the first pages of the service book, or ask us — we check it against the VIN. Send the code or the VIN with your enquiry and we will supply the right unit.

Other gearboxes for the same cars

Other gearboxes from our range that fit the same makes:

Buying a used gearbox safely

Every gearbox is tested before dispatch and sold with a warranty. Send us the registration number or VIN with your enquiry and we will confirm the unit is the correct one for your car. We normally answer enquiries the same working day and ship quickly across Finland and the Nordics.

Ask for the price and availability using the form below.