What year FJ80 is best?....

[locrwln]

So will a FF from a later 80 bolt up to an earlier 80 that came with a SF?

As far as I know, it does. The only thing is that the rear discs brakes are too big for 15" rims, so you need a minimum of 16" rims to clear the calipers.

 

[Pskhaat]

So will a FF from a later 80 bolt up to an earlier 80 that came with a SF?

Yes it will. As locrwln stated, the rear calipers require 16" wheels to clear. There are ABS sensors IIRC on the FF which you simply would just ignore on an FJ80.

I have compared my FF and fj803fe's SF 80 axle and the pumpkin/pinion flange offset et al seem to be within the tolerances of my tape measure, so if they're different at all, they're VERY close.