what are the benefits of adding an ITR 4.785 FD into a Y80 (GSR) tranny w/ LSD?

 

you'll get better gears, and getting through the gears quicker. The best tranny to installing a 4.785 final Drive would be B16A LSD tranny. that woule equal to a 98 spec R tranny. GSR LSD tranny is a good tranny, but i just beleive the B16A tranny would be much better for an all motor car.