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Most 90+ FJ80's have a 8" hi-pinion 4.10:1 diff. It'll practically drop in a 79-85 solid axle front housing. The electric locker will work too, but requires some fabrication on the axle housing.
I don't know what other ratio's are one the FJ80's besides 4.10:1
When looking around for mine (Bundy) I found a 4.3 from a petrol and a 4.88 from a turbo diesel (very rare apparently) I bought the 4.3 as it was way cheaper. The ratio didn't matter to me as it runs 5.29's.
