I personally think a hilux diff is a bit of over kill for a 4agte but anyway.
If you get a diff out of an RN25 or 27 you wont need it to be shortened!
I just got my hilux diff back today after getting TA22 mounts welded on. It cost me $200 which included getting some bearinsg press off some other things.
You can get all different ratios and this will depend on what you want to do.
I think the G series is an 8 inch.