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MOST USED TOOL Diff ratio finder Revs you want at the speed you cruise, on the tyres you run. Out comes the ratio, and the diffs we have in stock to match. Open calculator Everything we know about diffs, free
Calculators, identification guides, fault finding by vehicle and 50 plus plain English articles from the workshop floor.
Tools
Guides
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Repair or Exchange Diff: Which One Do You Need? Same price, different wait. How to decide. 
Best LSD for Street Use: Helical vs Clutch-Type Which LSD suits how you drive. 
Differential Identification: ID Your Axle Before you order parts. 
Axles: 28, 31 or 35 Spline? How much is enough for your power. Quick answers
How do I know if my diff is failing?
A whine that changes with road speed, a clunk on take-up, or metal in the oil. Any of those is worth a look before it gets expensive.
Exchange or repair, what's the difference in price?
None. Exchange is the same price as a full rebuild; you just skip the wait.
What oil should I use?
Our exchange diffs are warranted on Redline 75W140NS. Most LSDs want 75W140; open diffs are fine on 75W90.
Do you ship outside Christchurch?
Everywhere in NZ, free both ways on exchange diffs, and DHL Express overseas.
Can I fit an exchange diff myself?
Yes, and the warranty still applies if it's fitted correctly and filled with the specified oil. Fitting guides are in the trade portal and on request.