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View Full Version : highway RPM's with 3:73's

475HP '03 cobra
11-25-2005, 08:23 PM
on a 2001 GT what kind of RPM am i looking at while cruising on the interstate at about 80MPH?

also how many MPG am i gonna lose?
Scothew
11-26-2005, 12:40 AM
Assuming a 5-speed, you'll see about 2600 rpm which wont be bad at all. You might acctually pick up a MPG or two. It wont be bad at all. Good all around gear.
475HP '03 cobra
11-26-2005, 01:34 AM
yeah, she's a manual...well if its that low what would i be looking at with 4:10?
Wall96cobra
11-26-2005, 05:49 AM
I'd stick with 3.73's in a GT
EZ SPEED
11-26-2005, 06:57 AM
We have 4.10's in our 2004 Mach 1 Auto :banana:
QWKSNKE
11-26-2005, 06:58 AM
I'd stick with 3.73's in a GT


:werd:
475HP '03 cobra
11-26-2005, 08:56 AM
would you guys say 3:55 over 3:73? i really will never be on the highway becuase i have no reason to be, but every once and a while i have to make a trip to fun ford and other shows.
Scothew
11-26-2005, 09:54 AM
3.55 wouldnt be a big difference over the stock 3.27's. I'd defintely go 3.73's for a street/mild track gt. Great all around gear. 4.10's are good and fun, but in a SOHC 4.6 it starts getting into its powerband sooner than a 4v and it may effect gas mileage slightly. If thats a concern at all, stick with 3.73's.

Btw, at 80 you will be about 2800-2900rpm in 5th.
475HP '03 cobra
11-26-2005, 10:00 AM
cool...now will any of my mods effect this? i know a blower will but i dont have nor do i plan to get one ( just going to wait and buy an '07 shelby in about 5 years after they drop a little)
Scothew
11-28-2005, 01:32 AM
You can do whatever you want and the gears will only compliment it.

Oh and when you change your speedo, you can use a chip or a speedcal. Personally I would go with a Chip (like teh SCT chips, I use Doug904 of bamachips.com) just because on top of speedo recalibration, you can get a custom tune including more power, better cooling effects, better driveability and a good chance of getting better mpg.
rtusnake
11-28-2005, 02:37 AM
I had 3:73s in my 96 gt and liked them alot
uvbnhad
11-28-2005, 06:18 AM
80mph with 3.73s in an 04 GT is right over 2500 so it will probably be the same for you. You'll definitely like it. I ended up getting right at 30mpg going from Birmingham to Gatlinburg in the car with those gears and a tune.
475HP '03 cobra
11-28-2005, 01:02 PM
30 mph or mpg?
CrazyInBlack
11-28-2005, 02:15 PM
I had 3:73s in my 96 gt and liked them alot

I had 3:73s in my 98 gt and liked them a lot :banana:
QWKSNKE
11-28-2005, 02:46 PM
30 mph or mpg?


mpg
DSkeet
11-28-2005, 03:33 PM
3.73's
uvbnhad
12-02-2005, 10:16 AM
I checked today on the way into work and 80mph is 2400 RPM.