fj40 help

[ant90]

I have a fj40 and im looking at puting a front diff from a 85 crusier will the gear ratios be fine and would there be any thing else i have to do to make it fit

 

[Crushers]

depends on the year of the 40 and which vehicle the front diff is coming out of.
4.11 or 3.70?
different 1985 model cruisers have different gearing.