Gearhead Diffs

22/05/2026

Big order of ring and pinions arrived in today. All front and rear diff aftermarket ratios for Toyota Hilux and Landcruiser, Nissan Safari, Next gen Ranger, Holden Colorado, and some classic Chev!

gearheaddiffs

18/05/2026

13/05/2026

Who needs a flash paint job anyway?

Just finished up the diff on one of these classics and had to grab a photo while they were all lined up outside the shop. Real character beats shiny paint sometimes.

GearheadDiffs

01/05/2026

Another GT-R extended sump done and dusted!

Never get over how good these come out 🤤

03/04/2026

31/03/2026

We’re pleased to announce that Gearhead Diffs is now an official Farmlands Card Partner.

Farmers play a huge role in keeping New Zealand moving, and we’re proud to support that.

Farmlands shareholders can now access exclusive pricing across New Zealand’s leading range of exchange diffs, covering most common makes and models — along with rebuilds, upgrades, and more.

From Hilux, D-Max, and Colorado through to Land Cruiser and more, we’ve got you covered.

Whether it’s the farm ute or the work truck, we’ve got you sorted.

27/03/2026

R34 GTR diff upgrade done 👊

Factory 3.54 out ➡️ 4.11 ratio in — much sharper acceleration and response through the gears.

Finished off with a billet solid pinion spacer and a Cusco 1.5-way L*D to put the power down properly.

This thing’s going to feel like a different car 🔥

*d diffbuild gearheaddiffs

11/03/2026

This 1955 Ford F100 is ready to roll again after we rebuilt the Borg Warner diff it has fitted (Originally from a Ford fairmont).

We turned this around quickly to get the customer ready for the Twizel show and shine this coming weekend so he can make the drive with some peace of mind!

16/02/2026

Toyota Supra MK4 (JZA80) 200mm Rear Diff 🔧

Fully rebuilt Supra diff featuring a brand new Cusco 1.5-way L*D and 3.7 ratio for strong traction and responsive performance.

✔ 200mm MK4 Supra diff
✔ Brand new Cusco 1.5-way L*D
✔ 3.7 ratio
✔ All new bearings & genuine seals
✔ Solid pinion spacer upgrade
✔ Vapour blasted rear cover & gold zinc hardware

Built for street, drift, and high power 2JZ setups. Ready to install.

L*D JDM GearheadDiffs

16/02/2026

Mazda RX7 FD (FD3S) 3.9 Ratio Rear Diff 🔧

Rebuilt FD diff featuring the rare 3.9 Spirit R ratio and factory helical (Torsen-style) L*D for smooth, predictable traction and excellent street performance.

✔ Rare 3.9 Spirit R ratio
✔ Factory helical / torsen L*D
✔ All new bearings
✔ Genuine Mazda seals
✔ Solid pinion spacer upgrade
✔ Professionally set up & ready to install

Perfect for street, grip, and high power rotary builds wanting a balance of acceleration and cruising.

JDM HelicalL*D GearheadDiffs