I have a Quaife dog box in the car. It's an ST170 with the 6-speed Getrag.

The Quaife crownwheel is about 1cm larger in diameter than the standard. This means the VSS sensor wont fit in the hole as it is fouled by the crownwheel. Quaife was blissfully unaware of the problem before now.

My plan is to machine the sensor mounting eccentrically (ie move the centre of the mounting boss) so I can get it back in there. The sensor is already offcentre and I can take advantage of that without damaging the sensor - I dearly hope.

But I had a sudden heart-in-mouth moment that the Hall-effect trigger might be an embedded magnet rather than just the admittedly ferro-magnetic teeth.

Meanwhile I was thinking of putting 12v across a sensor I have on my bench, attaching an LED and waving various bits of metal at it to see which might be right.

On the other hand, if you know anyone who has a similar dogbox, I'd love to hear from them...

Cheers.