“Which PTO does my truck need?” is the question our team is asked most. Most people start from the truck brand, but two trucks of the same brand and the same year can leave the factory with different gearboxes — and the PTO bolts to the gearbox, not to the truck. So the question to settle first is which gearbox is actually in the truck.

Four ways to establish which gearbox a truck has: the plate on the housing, the truck papers, the dealer, or photographs sent to VPS Four ways to find out which gearbox you have Gearbox plate stamped on the housing Truck papers and check for a swap Truck dealer look up by chassis no. Send us photos we identify it You can go straight to the last step at any point, including first.

Start with the plate on the gearbox

Most gearboxes carry a model code, either on a riveted plate or stamped straight into the housing, usually on the side and often near the PTO aperture. Wipe the oil film off it and photograph it straight on. If you can read that code, it is all we need to match a PTO to it.

On older trucks the plate is frequently missing, painted over, or worn flat — and on some gearboxes it was never easy to find in the first place. That is normal and it is not a dead end. Move on to the next step.

Check the truck papers — then check whether the gearbox is still the original

The registration book gives you the truck model, the chassis number and the engine number. That is usually enough for a dealer, or for us, to work back to the gearbox the truck was built with.

Be careful with one thing. The papers describe the gearbox the truck left the factory with, not necessarily the gearbox that is in it today. On a used truck, a rebuilt truck, or anything that has had a gearbox replaced, the paperwork can be perfectly correct and still point you at the wrong PTO. If you do not know the history of the truck, treat the papers as a clue and confirm it against the gearbox itself.

Ask the dealer who sold the truck

Main dealers can normally look the specification up from the chassis number, gearbox included. This is the quickest route when the plate is unreadable and the truck is still on its original driveline.

Send us photographs and we will identify it

This is the route most of our customers take, and it is the only one that does not depend on the paperwork being right. Send the photographs below to our team on LINE or WhatsApp and we will tell you which PTO fits. There is no charge for it, and asking does not commit you to anything.

  1. The gearbox from the side — the whole unit in frame, with the PTO aperture cover visible.
  2. The PTO aperture with the cover off — close enough to see the gears inside.
  3. The truck itself — so we can see which model it is.
A truck gearbox seen from the side, with the PTO aperture cover and its mounting bolts visible
The gearbox from the side, with the PTO aperture cover in the middle. This is the first photograph our technicians ask for.
The PTO aperture on a truck gearbox with the cover removed, showing the drive gears inside
The PTO aperture with the cover off. What is behind the cover tells our technicians more than the outside of the gearbox does.
Isuzu truck chassis cabs at the VPS workshop, photographed to show the truck model
A photograph of the truck itself. It will not settle the gearbox on its own, but it narrows the search quickly.

Before you take the cover off: park on level ground, stop the engine, set the parking brake and chock the wheels. Gear oil can run out as the cover comes away, so have a tray underneath. Our PTO safety checklist covers the rest of what to make safe before working on the truck. If you cannot get the cover off, send the other two photographs and we will tell you whether we need more.

Why we ask for a photograph instead of guessing

Two gearboxes can look the same from outside, take the same number of bolts around the aperture, and still need different PTOs. What decides it is on the inside: the drive gear, how many teeth it has, and how it meshes with the gearbox.

Our own range shows how little the outside tells you. Of the 85 PTO models VPS makes, 33 use an eight-bolt mounting. Add a twelve-tooth drive gear and four are still in the running — and those four are not interchangeable, because they belong to two different truck brands.

Counting bolts and teeth narrows 85 PTO models down to four, but never to one What the outside of a gearbox can tell you — and where it stops 85 PTO models everything VPS makes 33 left with an 8-bolt mount 4 left and 12 drive teeth Still not one a technician decides Those last four belong to two different truck brands and do not interchange.

A PTO that is close but not correct will usually bolt on. The damage shows up afterwards: the gears whine, the teeth wear, and the repair bill is for the gearbox rather than for the PTO.

Frequently Asked Questions

My gearbox has no plate. Can you still tell me which PTO I need?

Yes. A large share of the trucks we are asked about have no readable plate left. Send a photograph of the gearbox from the side and, if you can, one of the PTO aperture with the cover off; our technicians work from those. A photograph of the truck helps as well.

The registration book lists the gearbox. Is that enough?

It is a good starting point, and on a truck that still has the gearbox it was built with it is usually right. It describes the original specification, not the current one, so on a used or rebuilt truck confirm it against the gearbox itself before ordering.

Can I choose a PTO from the truck model alone?

No. Two trucks of the same model and year can carry different gearboxes, and the PTO bolts to the gearbox. The truck model narrows the search, but it does not finish it.

What does it cost to have VPS identify the gearbox?

Nothing. Send the photographs to our team on LINE or WhatsApp and we will tell you which PTO fits. You are not committing to an order by asking.

Not sure what you are looking at? Send us photographs of the gearbox and tell us what the PTO has to drive, and our team will confirm the model — or, once you know the gearbox, see how to choose the right PTO.