Ariman,
I'm gonna go out on a limb, and say if you have a passenger side drop on the Tcase, you DONT have the same 7.5" front diff that we have in the Tacomas (95.5-present years). Although some of the innards of the Taco 7.5" are the same as the earlier IFS front 7.5" that we had from 86-95.5. I'm not sure if the gears are the same, as the Taco fronts are high pinion.

I did some looking on your axle code, and its hard to tell what you might have. But I have always seen that once they changed the "format" of the codes with the newer models after 95.5, that the codes dont always seem to make much sense, or actually match what is installed in the vehicle.

part way down this webpage is an example of the chart: http://www.brian894x4.com/Gearratiosanddiffs.html

Further down is pics and example of our early IFS front diff (86-95.5)