The problem is you have a axle from a U.S built truck but your vin is a japan built. Yes by the chart your correct in your first post but in the parts catalog by vin# the info I posted earlier is correct. So I ask if you are the original owner? and if not what work did the previous owner have done? I have also learned that the TOYOTA axle code chart is not always correct quite a few techs and the older parts guys kinda laughed when I asked where this chart was. a few said you can't believe everything that you read. But all this aside here's what I have come up with according to Toyota you have a 7.5 housing 3.58 gear set and a 2 pinion. BTW the charrt you looked at is for '89 to '93 trucks.
94 to 2004 TOYOTA TRUCK AXLE CODES
FIRST DIGIT SECOND & THIRD DIGIT FOURTH DIGIT
DIAM OF RING GEAR GEAR RATIO # OF PINIONS
A=7.5" 01 =3.583 A= 2
B=8.0" 02 =3.727 B = 4
03 =4.100 C = 2 PINION OEM LIMITED SLIP
04 =4.56 OR 4.30
05 =4.700
06 =4.87 OR 3.909
