I just got the 4.10's installed the other day with some pro3i upper and lower control arms. I did the heat the gears up and let them cool treatment a few times. Then let them sit overnight. I don't even know if this is needed to "break them in" but better safe than sorry. 
As for the UCA's and LCA's they have changed the ride for the better. I can't hear any extra noise from them (they are actually quieter than my stock ones) and they really help to plant the tires on acceleration while keeping the car going straight (not as much fishtail when hitting 2nd gear). Overall they seem to give a "stronger" feel to the rear of the car when going around corners or going straight, the stock control arms felt mushy compared to these.
Now since the UCA's and LCA's seem to really help plant the tires I really don't have a huge problem with the traction. Don't get me wrong though there are absoulty no problems getting the tires to bark or peel out, I just don't feel like I'm gonna throw the car into a 360 from the 1-2 shift, as I have read from some other posts. Overall they seem to make the car a lot stiffer and sure footed.
1st gear is a little short but very strong but not so short that I'm not able to use it. Its kinda cool that you can let the clutch up with out hitting the gas and start moving instead of stalling. If I get a good launch (not just nailing the gas from a stand still smoking the tires) it seems that the tires chirp pretty much the whole way through the gear (just little squeeks, not sitting there smoking them)
2nd gear to me feels *almost* like 1st used to with the 3.27's (the largest simmilarity starts around 2500 to 3000 rpms). The 1-2 shift barks the tires much harder, but I think that the UCA's and LCA's are helping to keep them planted. The rear will sway back and forth a little bit, but it feels a lot stiffer and a lot more sure, not like the rear end is bending up the back of my car, or that I am gonna lose control.
3rd gear is simmilar to the old 2nd gear only it is a breeze to get a good bark from the 2-3 shift with the stock shifter.
4th gear pulls very hard compared to how it used to be, somewhat simmilar to old 3rd.
5th gear will actually let me accelerate now. I don't feel like the car is puking or out of breath when I hit the gas down.
I know that there are plenty of articles on here about gears, but I figured it would never hurt to have another person's opinion when doing research on the forums
As for other mods, all I have is a Magnaflow catted X and cat back, Pro3i subframe connectors, and a K&N FIPK II.
As for the UCA's and LCA's they have changed the ride for the better. I can't hear any extra noise from them (they are actually quieter than my stock ones) and they really help to plant the tires on acceleration while keeping the car going straight (not as much fishtail when hitting 2nd gear). Overall they seem to give a "stronger" feel to the rear of the car when going around corners or going straight, the stock control arms felt mushy compared to these.
Now since the UCA's and LCA's seem to really help plant the tires I really don't have a huge problem with the traction. Don't get me wrong though there are absoulty no problems getting the tires to bark or peel out, I just don't feel like I'm gonna throw the car into a 360 from the 1-2 shift, as I have read from some other posts. Overall they seem to make the car a lot stiffer and sure footed.
1st gear is a little short but very strong but not so short that I'm not able to use it. Its kinda cool that you can let the clutch up with out hitting the gas and start moving instead of stalling. If I get a good launch (not just nailing the gas from a stand still smoking the tires) it seems that the tires chirp pretty much the whole way through the gear (just little squeeks, not sitting there smoking them)
2nd gear to me feels *almost* like 1st used to with the 3.27's (the largest simmilarity starts around 2500 to 3000 rpms). The 1-2 shift barks the tires much harder, but I think that the UCA's and LCA's are helping to keep them planted. The rear will sway back and forth a little bit, but it feels a lot stiffer and a lot more sure, not like the rear end is bending up the back of my car, or that I am gonna lose control.
3rd gear is simmilar to the old 2nd gear only it is a breeze to get a good bark from the 2-3 shift with the stock shifter.
4th gear pulls very hard compared to how it used to be, somewhat simmilar to old 3rd.
5th gear will actually let me accelerate now. I don't feel like the car is puking or out of breath when I hit the gas down.
I know that there are plenty of articles on here about gears, but I figured it would never hurt to have another person's opinion when doing research on the forums
As for other mods, all I have is a Magnaflow catted X and cat back, Pro3i subframe connectors, and a K&N FIPK II.
Good ole American Muscle 
