Over the many years I've been collecting bits I've acquired both a 4.5 ratio and a 4.7 ratio gear set to suit T-series
They're are both second hand in 4WD Townace IFS front diffs (I know it sounds odd, but 4WD import townaces ran independent front diffs which were T-series and the gears fit any other T-series diff)
These Townaces also run free wheeling hubs on the front, as such the diff probably haven't seen many rotations at all.
They both look like this:
$300 each.
Both items are located in Wollongong NSW. Item is pick up only, unless the buyer is willing to arrange their own freight. I can package it up and have it ready for a pick up.