What do you with 3.55's think of them? I drive about 250 miles a week no-highway and 600 miles to-from Michigan a month. How will they effect my gas milage? I have ready conflicting posts on here. There is a guy local selling the gears for $35, he pulled them out of his mustang and is unsure of the milage. Any way to tell if they are good or bad? How do I tell by looking at the gears if they are 3.55's? Are they worth it or should i just get a 3.27 t-loc pumpkin and swap it in? My car is currently 3.08 open.