Axles: 28, 31 or 35 Spline, How Much Is Enough?
Axle spline count is one of the first questions on any Ford 9 inch or Holden build. Here is what the numbers mean and how much strength you actually need.
George Bull, owner 1 min read
The spline count on an axle tells you how many teeth engage with the side gear, and more splines on a bigger shaft means more strength. The jump from 28 to 31 spline is significant, and 35 spline is a different league again.
Rough guide
- 28 spline: fine for a standard road car and most mild street builds
- 31 spline: the sensible choice for a strong street car, a tow vehicle or anything with sticky tyres
- 35 spline: drag racing, big power and off road abuse
Do not forget the carrier
Changing spline count means changing the carrier or LSD centre to match, so it is worth deciding on the spline count before you buy the centre. We can supply matched axle and centre packages for the common housings.
Think your diff is making noise? Around 120 rebuilt exchange diffs on the shelf for 30 plus makes and models. Fitted here in Sydenham, or shipped anywhere in NZ with free freight both ways.
AxlesFord 9 inchUpgrades
