Outer Limits 4x4 Board

Hiya guys,

couldnt find much in the bible.
Just a new rear diff for a 98 diesel 100 series. (pov pack)
Are they a 4.3?
And what year did they run this diff up to?

Thanks,
Luxy

All 100s except the factory t/deisel run 4.3 diff gears

t/d factory and all v8's run 4.1 all else 4.3

All live axle "105's" run 4.3:1 diffs.

V8 and TD's (IFS) run 3.9, 4.1 or 4.3:1

Thanks guys!