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Has anyone used deeper diff / spring saddles?..If so, do they comply with the NCOP guidelines?

Yes and Yes.

Its far better doing it this way than using blocks which normally raise eyebrows, you will need longer Ubolts as well.

The other option is to have your springs reset, not that expensive and better fit all round if you dont want to touch the diff.

Greg

Cheers!

AFAIK, NCOP does not prohibit deeper spring saddles. There is some specific guidance for lowering blocks, but that would not apply in this case.

Parts of NCOP that may trip you up (NCOP Section LS Tyres, Rims, suspension and Steering, section 4.7):

When lowering a vehicle, it must continue to comply with the minimum ground clearances and running clearances specified in ADR 43/... and in the AVSR.

Following the completion of modifications the vehicle attitude must remain as per original specifications – i.e. the original relationship between the front and rear suspension heights must not be changed and therefore the front and rear suspensions must be both raised by the same amount.

When lowering a vehicle, the ride height of an unladen vehicle must not be changed by more than one third of the working travel of the suspension from its original height to a rigid bump or rebound position specified by the manufacturer. The suspension bump and rebound positions are measured with any deformable bump or rebound stops removed. The original relationship between the front and rear suspension heights must not be changed and therefore the front and rear suspensions must be both raised or both lowered by the same amount.

Cheers,
Harv

They’re only just a bit better than lowering blocks result in my opinion. Yes, they improve static integrity but like lowering blocks they increase radial stress on the leaf springs.

Easy enough to reset your leaf springs cold (or hot, you being a boily) using a cheap shop press. Cost me $120 and good for wheel bearings too.


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Thanks for the replies everyone!

Cheers!