don't go with genuine! probably the worst ones out on the market. i think the better ones are precision gear
and fj80s were never available with 4.88s. it's 91 or 92-95 4runners and pickups with a v6, auto and stock 31" tires that got the wierd 4.88s. supposedly they have the same carrier as a regular v6 third member, but can only be regeared with the same toyota factory 4.88 gears.