Well if its 4wd you most likely have 4.10 or 4.30 gears

This is right in the FAQ:


AXLE- Gear ratios
Axle code found on door jamb
A10A = 4.10
A11A = 4.30
4.10's usually came in manual transmission 4x4 trucks, 4.30's in auto transmission 4x4 trucks.


1996 T100, Mickey Thomson Classics, Bridgestone Dueler AT 265/75/16, custom offroad KC's.