robcon27

I have a 04 gt and want to throw in a set a gears but I would like some feed back on on a few questions. Im want to go with a 410, but I dont want to kill fuel economy, city driving isnt a issue, its highway. What kinda rpm's are you guys running with 410's at like 60 or 75. Also what kinda drop in et's are you getting with the gears and what do you do to correct the speedo. If there are any other issues you know about let me know. Thanks guys

Ehmark

I have 4.30's and at 80 mph im at 3100 rpms. Fuel economy in town is the same(Horrible) highway is down to 20 mpg from 24.

SVTeeshirt

https://mustangforums.com/forum/4-6l...at-thread.html

look in there theres one on 4.10s vs 3.73s and maybe some others.

devore86

With 4.10s 75mph is roughly 2900 rpms and the decrease in fuel economy isnt thats noticable. Well worth it, in my opinion.

SVTeeshirt

^ seems to be the general consensus, some people have actually reported an increase in gas milage due to being in the next gear, i think its right around the 55mph speed limits tho not the highway.

WhiteFoxGT

go 4.10s and dont look back

SilvrStang

4.10s all the way its just a right gear.

boduke0220

4.10's..3.73's arent worth it. i rode in my friends car with 373's an couldnt tell a difference but when i got my 4.10's put in i could tell a major difference. no more bogging when ya floor it and it just pull so good, like i've added 50 hp or something. therpms arent that high. like 2 grand at 55 and i havent been over 55 so idk how the top end is

WhiteFoxGT

Cruisin at about 75-80 is right on 3k rpms...

its not gonna hurt anything, and I still got ~21mpg on my way to ocean city and back, and that was all 3k rpm cruisin

_MightyMouse_

55mph = 2k rpm's
68mph = 2.5k rpm's

Go 4.10's. You won't regret it. Good install price is around $250, unless, of course, WhiteFox will install them for you even cheaper