3.73 install

me and my buddy are gonna install my frpp 3.73's....how much should it cut off my 1/8th ET



2004 Mustang GT coupe 5spd-competition orange
Stalker Body kit, 17x9 Chrome Cobra R's, Billet grill, 35% window ting

Diablosport Predator, Offroad H pipe with weld in flows, K & N airfilter, 3.73's still in the box

8.92@ 79 mph 2.0 60ft...........1/8th mile kan. valley dragway, 560ft elv.
 
I hope u and ur buddy knows what your doing. Gear is one thing that i don't mess with. u'll need micrometer to mesure back rash, and set it just right, otherwise it'll whinne like bastard, or chew up ur rear end in worst case...