if you have enough power the less you will be able to feel the difference b/w ratios, unless you go the the extreme like going from 4.10s to 2.73s you could feel that i am sure but a small change like 4.10 to 3.55 wouldnt feel any different.
cenok i think you would be fine going to 3.55s from 4.10s if it did lose a little sotp feel ( it would be small) it would more than gain it back in, highways rpms, driveabilty (less shifting/easier to drive) and each gear would be longer. going to high of a gear will be killer down low but before you know it the cars already done at around 100 mph
i am running 3.90s with a z spec t5 in my car and since i added my SC, with just a mild 5 psi its got all sorts of traction issues now, it hooked good before, but now its just frying the tires in first and all the way through second. and i mean burning rubber not just squealing them a bit
my rearend is getting a little tired, its starting to do the one wheel peel sometimes i am thinking of going back to 3.55s or something to get some use out of first. its got the power but with the lower gear its just spinning the crap out of the tires and it sucks. plus with the low gear its gone through 4th gear at a little over 100 and its done. i dont want to hotrod it in 5th, no point there.
with 3.55s i doubt i would lose any sotp feel. if it did lose a tad bit it would drive better and gears would go longer which is worth it to me. may even feel faster since it would be in boost more instead of roasting the tires through the gear.
what i am saying is gears IMO dont make as much difference on a modded car. on a stock mustang that make a big difference because a bone stock 5.0 isnt very powerful and undergeared from the factory it really limits what the engine can do a set of gears make it better.
but i've driven/rode in alot of difference mustangs. some with similar mods, some with different mods, all difference gear ratios and honestly i cant tell a difference at all on what gears they are running by sotp feel.you could maybe guess by how the gears act. how long they last and etc. but then again difference mod and combos have an affect on how fast and engine will rev up and whatnot.. i can tell when a mustang has stock gears but if its anything lower than 3.55s it feels the same. going higher than 4.10s you would probably tell because the gears would be short but anything int he 3.55 to 4.10 range feels the same to me sotp wise.