Since you didn't give any information, like what model Nissan, 2WD/4WD, or any other options that may affect the gear ratio, it's impossible for anyone to help you here. My best advice is that if it is important enough for you to need to know this, you should find/purhase a service manual for your specific vehicle and look it up.
3002 gears
84 and 85 are matches
6
6 gears 1 down 5 up
Because it needs more gears to get up to speed because it doesn't have good acceleration.
a jack.
Nissan. the Rangers have tall rear end gears.
cam sheft gears
4.08
85 and some 86
Answer Belt.........
no 84 and 85 swap out.