....................A lot of 3.0l v6 2nd gen runners came with 4.56 gears And the automatics that came with 31" tires had 4.88 gears factory....................
Along w/2nd gen Runners, the 4.56 and 4.87gear sets were also available in the 3rd gen trucks. Since a lot of people run bigger tires, just looking at the equipment wont likely help you that much in the wrecking yard, so you will need to check the door jam plate/sticker code. Also, don't look for the tire size on the sticker either, the tire size was left the same, only the gear code was changed. The gear code for the 4.56 gear set is G25(4 or 2), and the code for the 4.87's is G14(4 or 2).
The "G" is for the 8" diff., the next two #'s are the gear size, the (4 or 2) is for the number of pinion gears, the 4cyls. have two, the V6 had 4.