toyota rear ?

my problem is that early to day i tried to buy a toy rearend but,they asked me if i new the gear ratio on the toyota rearend i did not no it so then i asked them if there was a diff in a 84-88 axle they said no but there a diff on 89-94 i was wondering if somebody could please help

get one with somewhere in the 3.7-3.8 range you dont want the 4.10 gears.