THE SOUTH ISLAND'S LARGEST DIFF SPECIALIST Rebuilt exchange diffs.
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Rebuilt exchange diffs.
Ready to fit today.
Around 120 rebuilt differentials on the shelf for 30 plus makes and models. Same price as a rebuild, none of the wait. Free freight to anywhere in New Zealand and back.
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Three ways we can help
Diffs only. Nothing else, so every job is done properly. Exchange diffSwap your worn diff for a rebuilt one off the shelf. Fitted same day, or freighted anywhere in NZ with the return leg booked for you.Most popular choice Repair and rebuildFull strip, inspect and rebuild of your own unit. Bearings, crownwheel and pinion, LSD, seals. Same price as an exchange, for vehicles we don't stock.Book a diagnostic Parts and upgradesBearing kits, ring and pinion sets, Wavetrac and Disctrac LSDs, Motul and Redline oils, Part Time 4WD kits. Retail and trade.Shop parts
How an exchange works
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. Fitting in our Sydenham workshop if you're local.
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.
Popular exchange diffs
See all exchange diffs
IN STOCK, SHIPS TODAY Holden Colorado RG Rebuilt Exchange Diff 2012 to 2020, 3.42 / 3.73 / 4.10, factory helical LSD $2,095 
IN STOCK, SHIPS TODAY Ford Ranger PK/PJ Rebuilt Exchange Rear Diff Also suits Mazda BT-50 $2,765 
IN STOCK, SHIPS TODAY Holden Commodore VT to VZ 3.73 M80 LSD Exchange Diff 3.08 also available $2,495 
IN STOCK Holden Colorado RC Rebuilt Rear Exchange Diff Also suits Isuzu D-Max, options from $2,495 4.9 ★ Google rating from 180 reviews Pulled in live from Google.
★★★★★"Diff arrived next morning in Dunedin, fitted it that afternoon, old one picked up the day after. Couldn't be easier."Ranger owner, Dunedin
★★★★★"We send all our diff work here. George tells you straight what it needs and the exchange units save us a hoist for a week."Workshop owner, Christchurch
From the workshop
All articles
Isuzu D-Max · 20 July 2026 Isuzu D-Max Diff Failure: Why the Open Carrier Gears Give Out Has your D-Max developed a clunk or grind from the rear end? 
Repair vs exchange · 19 July 2026 Repair or Exchange Diff: Which One Do You Need? If your differential is making noise, leaking oil, or underperforming, you usually have two options. 
Maintenance · 29 July 2026 Water in Your Diff: How It Gets In, What It Destroys, and What It Costs You One of the most destructive problems a differential can have.