Exchange diffs, explained

A rebuilt diff off our shelf, at the same price as rebuilding yours, without the week off the road. Here's exactly how it works, what it costs, and what happens to your old one.

Browse exchange diffs Check my rego

Rebuilt exchange diff on the bench at the Gearhead Diffs workshop

120rebuilt units on the shelf

30+makes and models covered

$0freight, there and back

12 moor 20,000 km warranty

What you're getting

Every exchange unit is stripped to the housing, inspected, and rebuilt with new bearings and genuine seals. Where the crownwheel and pinion are replaced we use good-condition OEM gears from our core stock, which we rate above small-batch aftermarket sets. Each unit is set up, tested and tagged with its ratio and build date.

Core charge, up frontThe price includes a core charge for the crownwheel and pinion. Send your old diff back and if the gears are reusable we refund it. No surprises later.

Freight booked both waysWe book the outbound and the return pickup when you order. Your old unit goes in the same box and the courier collects it.

Ratio and LSD optionsMost models are stocked in more than one ratio and in both LSD and open form, so an exchange can also be an upgrade. Need a ratio we don't list? Ask. We may be able to source what you need.

Warranty12 months or 20,000 km, whichever comes first, when fitted correctly and filled with the specified Redline oil.

How an exchange works

Four steps, and the freight is on us in both directions.

1Order online or callPick your diff, or send your rego and we'll confirm the right one. Price includes the core charge up front.

2We ship it, freeOvernight to most of NZ. Local? Ready today after 2pm. Want us to fit it too? Book in with the team and we'll see when we can fit you in.

3Send your old one backThe return pickup is already booked. Put the old diff in the box and we collect it.

4Core refundIf the crownwheel and pinion are reusable, the core charge comes straight back to you.

Vehicles we stock

Live stock from the workshop. Not listed? Ask. We may be able to source what you need.

Holden Colorado RC and RGIn stock, 11 units Ford Ranger PX and PJ/PKIn stock, 9 units Toyota Hilux, Hiace, Land CruiserIn stock, 14 units Isuzu D-Max and BighornIn stock, 6 units Ford Falcon and CourierIn stock, 7 units Holden Commodore and RodeoIn stock, 8 units Mazda Bounty, BT-50, CX-5, CX-9In stock, 5 units Nissan Safari and NV350In stock, 4 units Mazda RX-7 and RX-8Low stock, 2 units Renault KoleosIn stock, 3 units Audi TTLow stock, 1 unit Something else?Send your rego and we'll check

Common questions

Is an exchange diff as good as rebuilding mine?

Same parts, same process, same people. The only difference is the housing isn't the one that came out of your vehicle.

What if my old diff's gears are stuffed?

Then the core charge stays with us, which is why it's built into the price. You won't get an extra bill.

How long does freight take?

Overnight to most South Island addresses, one to two days to the North Island. Rural delivery can add a day.

Can I fit it myself?

Yes, and the warranty still applies if it's fitted correctly and filled with the specified oil. Our fitting guide covers the common models.

Still not sure? Call 03 381 0320 or send your rego and we'll match the right unit.