So I have a 302 with a e4od and the rear end is a limited slip with 3.55 gears from the factory. I've topped the truck out at 101 as my bench mark top speed. All I have is a exhaust- cut 2nd cat ran 3" exhaust into flowmaster super 10 and dumped under the bed. My question is if I switched to 4.10s what would I see in improvements? How much top speed would I lose? How much would it affect my gas mileage?- get about 11 now At cruising speed- 65-70 I'm at 1800-2100 rpm. Would I notice a difference between 3.55 and 4.10?