Originally Posted by
wertyu78
The 3.64 FD suits our cars very well. I love it. I've tried a 3.15, 3.38, 3.46 and 3.64 - currently, I have a 3.64 in the car and have no plans to switch. Coming from an auto ZHP, it should have a finned cover which is pretty cool (pun intended).
My average MPG on the highway went from 32.5 with a 3.07, to 28. Not a bad loss considering the usefulness of the shorter gearing. On an autox course, you'll find you can keep it in 2nd for most of the course, and easily grab third on the higher speed stuff. For road course driving, you'll be in 3rd and 4th most of the time, grabbing 5th in the straights (like back of Road Atlanta).
My only suggestion would be to send it off to Diffsonline and have it built into a LSD. Sure, its a bit costly..... but it's so friggin worth it.....