You still won't have the diff clearance that you will get with 35s. But if I had to choose between locked on 33s and unlocked on 35s I'd go with the locker every day.
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100%, on that HC trip we did Winnie I came to a complete stop twice, with a thump, on brand new 33's and twin lockers. If the diff height is less than the obstacle height you will hit, simples!!! In Vic there are two ways to get a 35" legal setup - first is purchase a set of Portal Axles and get the eng cert done by Marks 4x4 but not for a GQ - for a GQ add 6k for additional certification costs; second way is get your vehicle assessed by an automotive engineer, not a VASS engineer and take your chances if you get pulled up as the Vic Police can challenge the certification by any engineer other than a VASS engineer - unsure about other states.
I keep wrestling with what I want and what is legal, so it looks like I will go with a enginered 3 inch lift with 33s on and a locker in the future I keep going around with this I see people with 4 inch and I want that but I suppose I better be smart about it
In Vic the 'rules' state 3" total lift being a combo of tyres and springs. You cant go 3" on the springs an 1" on the tyres and stay legal, so a good quality 2" lift and a set of 33's is your limit. A Vass Engineer simply wont sign off on it. Mind you maybe you will get away with it as long as the vehicle looks in proportion, and you never get picked up?
Well we have a new rule in QLD we can now get a certified 3 inch lift with 33s on
If you keep wrestling with an Idea, have road tyres (legal) and play tyres, (37's on a 17 inch rim) modify the guards properly to fit the play tyre and shave the Diff.
Diff shaving can give an inch of clearance. So, in theory you'll have a legal 2 inch suspension lift with legal daily tyres and with the offroad only tyres you'll have diff clearance equivalent of a 39 inch tyre and a sill (or overall lift) clearance equivalent of 4 inch and 35's.