Pretty sure the 98 petrol (4.5L), will have the H260 rear diff in it.
As far as I know, the only GQ's that came out with this size diff was the leaf sprung utes.
Have a look at the transaxle code for both vehicles, yours I am sure will be HH39, meaning it is a
H260 rear diff with 3.9 : 1 ratio.
If the Gq diff is out of a leaf ute, it will be HH43 (H260 rear diff with 4.3 : 1 ratio)
If it is out of a coil wagon or ute, most likely it will be HG41 (H233 rear diff with 4.1 : 1 ratio)
All the front diff centres are the same, only the ratio changes.
So you really need to research the actual vehicles that you plan to do the swap with, there are to many variables.
Hope this clears it up a little.
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