Originally Posted by ludeboom
4.10 gears huh
wow so wats your new top speed 85
my friend put 373 posi on his camino
his tops speed dropped from like 120 to like 100
so with 4.10 you are lookin at like what 90-95 at most ?
that Z is gonna shit on you on the highway baby
~boom
Many people have put 4.10's in new 5 speed GT's and it really doesn't hurt performance. Top speed will drop, but I don't think too many people get a chance to max out in a street race. Most street runs are short. 4.10's will favor you in most terrain as well, from pulls out of tight corners to steep hills, and 1/4 mile use on the weekend.
To give you an idea of their true effect here is what they do to 99+ Mustangs: hiway speed in a stock Mustang at 70 MPH you will be at about 2200 rpm. With 4,10's you will hit 2200 rpm at about 60/65mph. I haven't seen numbers or tests but I'm assuming that's approx 20 mph off your top end? Personaly I'd never race someone at that speed without rollbars and 5 point harnesses.