Compared to a GSR tranny, the 4.785 FD gearing is about 10% shorter through all the gears, which means cruise RPM would be 10% higher(your current cruise RPM+10%). If you're still running your stock single-core radiator, and you like to cruise at higher speeds, that may be enough to bring you close to overheating the puny Civic radiator. You may want to look into a dual core alumium Civic radiator, or a wider Integra radiator, especially if you like to cruise at higher speeds, and run your A/C or something.