i recently got a zexel torsen for my 84, i have 28 spline axles to put in it, but i don't know if i can use the gears that are in it, or if i'll have to buy new ones? i think it has 3:08, but not sure. if it does, will it fit on the zexel torsen?

 

No. You will need some kind of 3 series gears.