I'd definitely go for the Calmini kit - it's worth the money just for the control arms (which you can't buy separately). Apparently if you change the shocks to OMEs the ride improves substantially. Plus it's just so blue and blinging.
![Laughing :lol:](./images/smilies/icon_lol.gif)
I've got tough dog springs with a 3" lift in my SWB, with OMEs at the front and Ranchos at the rear. In hindsight, I'd go OMEs in the rear too. If you push it hard into a corner now it'll lift the inside front wheel because the setup's so soft.
I've got 235/75R15s on my SWB GV and I reckon you would need a bodylift to fit the 245/75R16s, 'cos no one wants to chop up such a nice car
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Even with the 235s I rubbed on the front bumper, but I just replaced that with a tube bar. If you wanted to keep the front bumper you'd probably have to trim it a little.
When I looked at doing a bodylift the only major drama I could see was the steering linkages. Liam from Big Balls Offroad has done a 3" bodylift to his GV, so would know more than me.
Another piece of info for you - the only 15" rims that will clear the calipers are F100 offsets. However because the standard GV rims are so negatively (or is it positively?) offset stock, the big F100 offset will stick out like dog's balls - Just in case you want to consider 15" tyres, as there's a bigger range, and secondhand 31s are cheap as chips.
Finally, IMHO the biggest limiting factor of the GV is the front diff. If yours has an alloy casing, expect it to bust. Don't bother fixing it the first time, just bite the bullet and replace it with a steel diff - that's what I should've done from the start. Then again, yours may already have the steel diff, I don't know which models have it and which don't.
The GVs are a HEAPS underrated performer, especially with the V6. I had an absolute blast with mine, and I sometimes feel like my Rangie does things harder than the Vit would've in the same circumstances.