hi guys

i currently have a v6 wt vitara, and am still contemplating swapping to a gv, except no one wants to buy my
vitara : ( Ive got a set of 5.12 diffs that i had in it, (front steel) and was running 31s which was perfect gearing, if i put 5.12s in a gv (series 2, 2002ish 2.5 litre) will it be perfect for 31s? or is the gearing different? also will it be a similar amount of work to fit 31s under a gv as on my wt vitara? or way more?
I just want to upgrade because im going to be going up north in a while and wpouldnt mind a bit more power and comfort, plus the vit tends to wander around a bit.
thanks guys