Difference in Gas Mileage Between 3.73 and 4.10's

Jeff99gt · April 24th, 2007, 01:37 PM

i just dont want to be toping out at 100 or 105

White99stang · April 24th, 2007, 05:01 PM

to top out at 105 you would need some 6.56 gears bud

undomesticfire · April 25th, 2007, 12:31 AM

I have 373's and went 12.7 with a 1.7 60' at 115 NA. I have nitrous but am still breaking in my new mmr1100. I will be adding a d1sc after my break in, about a month, do you think stick with the 373 or maybe go 410's

White99stang · April 25th, 2007, 12:36 AM

i want to know what type of power your making to trap 115 NA with 3.73's, cause i don't trap 115 N/A and i have 4.30's, making 320rwhp and my car weigh's 2900lbs

gills99stang · April 25th, 2007, 07:39 AM

+1 on the ?????

FordGT08 · April 27th, 2007, 11:45 AM

not a big difference go with 4.10s

Dawgs2099 · April 28th, 2007, 10:32 PM

Any difference between:

http://www.americanmuscle.com/fopege4ra.html

and

http://www.americanmuscle.com/mopepl4ge.html

Besides brand and price?? This is my next mod, but 159.99 sounds better to me then 239.99, unless I am getting crappy gears for 159.99.

Dawgs2099 · April 28th, 2007, 10:47 PM

http://www.americanmuscle.com/motive...gears-410.html

and these ones too.

MustangMatt96GT · April 28th, 2007, 10:50 PM

The Motives are known to whine! Go with the FRPP for gears!

Dawgs2099 · April 28th, 2007, 10:54 PM

The Motive proformance plus gears whine?? even though they state they dont?? Just wondering.

Also what section in my Haynes manual would I look under to install this do hicky?

MustangMatt96GT · April 28th, 2007, 11:26 PM

Let a professional install! Otherwise morethan likely it will whine no matter what type of gears you get. Motives have just been known to whine if the install isnt perfect! Some installs will some wont!

DrHolliday · May 1st, 2007, 08:42 PM

All I ever hear about on this site is Ford racing gears, and Motive... Anyone ever hear anyhting good or bad abour genuine gears?

cliffyk · May 4th, 2007, 02:25 AM

I've got about 1500 miles on my 3.73s now and find that I am getting 0.5 to 1.0 MPG less than with the stock 3.27 gears in my normal daily drive (50 miles each way, 15 miles at 45 to 70, 33 at 75-85, and the last 2 at 45-60; with only 10 traffic lights). 2500 rpm @ 80 mph.

I'm pleased with the change, for the amount of driving I do (sometimes 400-500/day on interstates) I think the engine speed increase of 4.10s (2750 @ 80) would wear thin after a while...

chris1 · May 21st, 2007, 12:06 AM

now i have a 01 gt and if i go with 18 x 10.5 deep dish rims would 3.73's be good enough to feel the difference...keep in mind im a daily driver on highway. willing to take any suggestions

chris1 · May 21st, 2007, 12:25 AM

i actually meant 18 x 10 sorry..lol

cliffyk · May 21st, 2007, 05:01 AM

As long as you do not change the outside diameter of the tires to something larger than stock (25.7") the diameter and width of the wheel have nothing to do with it (other than the added weight which requires more power to accelerate).

As an update, I find that if I consistently cruise above 80 (85-90) the 3.73s can easily eat up another 2.0 MPG more than the OEM gears. I figure that overall, at current gas prices, the 3.73s are going to cost me about $550 more per year (I drive 45k or so per year).

chris1 · May 21st, 2007, 01:29 PM

now as stupid as this sounds..(sorry) but how do you change the diameter of the tires? do you mean the size in tires??

cliffyk · May 21st, 2007, 03:57 PM

Tires sizes are specified as the tread width/aspect ratio-wheel diameter--the aspect ratio is the ratio of the sidewall height to the tread width, specified as a percentage...

So, a 245/45-17 has a tread that's 245 mm wide, an aspect ratio of 45, and is meant for a 17" wheel.

245 * .45 = 110.25 mm, so we know the sidewall is 110.25 mm high, add the sidewal height * 2 to the wheel diameter and we find that this tire is 110.25 * 2 + 17 * 25.4 or 652.3 mm, or 25.68" which is pretty close to the 25.7" most manufacturers state.

Now lets do a 275/40-17, 275 * .4 = 110 mm, 110 * 2 + 17 * 25.4 = 651.8 mm = 25.66" (again pretty close to 25.7").

OK, now let's do the math for a 225/45-17; 225 * .45 = 101.25 mm, so a 225/45-17 tire is going to have an outside diameter of (101.25 * 2 + 17 * 25.4) = 634.3 mm = 24.97" (25" is the quoted spec).

That's how you change tire diameters--buy tires of a different diameter...

DCstangGT · May 24th, 2007, 02:27 AM

What is the RPM at 60mph with 4.10 and with 3.73?

cliffyk · May 24th, 2007, 04:53 AM

60 in 5th:

3.27 rear = 1640
3.73 rear = 1870
4.10 rear = 2060

April 24th, 2007, 01:37 PM	#41
Jeff99gt Regular Join Date: Oct 2006 Location: Morgan hill CA Posts: 307	i just dont want to be toping out at 100 or 105 __________________ http://i168.photobucket.com/albums/u...ff99gt/yea.jpg

April 24th, 2007, 05:01 PM	#42
White99stang #1 Asshole Mod Join Date: Aug 2005 Location: elkridge, MD Posts: 2,398	to top out at 105 you would need some 6.56 gears bud __________________ 99 Mustang GT VT 302 Stroker (race car) 11.13@123 for sale 06 Dodge MegaCab. Cummins diesel power. Silencer ring removed, intake baffling mia, and swiss cheesed air box.

April 25th, 2007, 12:31 AM	#43
undomesticfire Newbie Join Date: Apr 2007 Location: Beaumont, TX Posts: 19	lol I have 373's and went 12.7 with a 1.7 60' at 115 NA. I have nitrous but am still breaking in my new mmr1100. I will be adding a d1sc after my break in, about a month, do you think stick with the 373 or maybe go 410's __________________ From a Dig or Nothing You'll Like My Taillights.

April 25th, 2007, 12:36 AM	#44
White99stang #1 Asshole Mod Join Date: Aug 2005 Location: elkridge, MD Posts: 2,398	i want to know what type of power your making to trap 115 NA with 3.73's, cause i don't trap 115 N/A and i have 4.30's, making 320rwhp and my car weigh's 2900lbs __________________ 99 Mustang GT VT 302 Stroker (race car) 11.13@123 for sale 06 Dodge MegaCab. Cummins diesel power. Silencer ring removed, intake baffling mia, and swiss cheesed air box.

April 25th, 2007, 07:39 AM	#45
gills99stang Hardcore Enthusiast 1999 Mustang GT 13.4 @ 100 Join Date: Sep 2006 Location: Virginia Beach, Virginia Posts: 2,491	+1 on the ????? __________________ Brendan '99 Mustang GT [318 rwhp N/A] For Sale: 2003 Boyd Coddington / Roush California Roadster http://www.moddedmustangs.com/forums...-roadster.html

April 27th, 2007, 11:45 AM	#46
FordGT08 Newbie Join Date: Mar 2007 Posts: 21	not a big difference go with 4.10s

April 28th, 2007, 10:32 PM	#47
Dawgs2099 Regular 2000 Mustang GT Join Date: Apr 2007 Location: Westland,MI Posts: 51	Any difference between: http://www.americanmuscle.com/fopege4ra.html and http://www.americanmuscle.com/mopepl4ge.html Besides brand and price?? This is my next mod, but 159.99 sounds better to me then 239.99, unless I am getting crappy gears for 159.99.

April 28th, 2007, 10:47 PM	#48
Dawgs2099 Regular 2000 Mustang GT Join Date: Apr 2007 Location: Westland,MI Posts: 51	http://www.americanmuscle.com/motive...gears-410.html and these ones too.

April 28th, 2007, 10:50 PM	#49
MustangMatt96GT I Post Entirely Way Too Much 1996 Mustang GT 14.631@93.51 @ 5800 FT Join Date: Dec 2006 Location: Lakewood, CO Posts: 6,958	The Motives are known to whine! Go with the FRPP for gears! __________________ We expect shit to break, look foward to realizing exactly when it is happening, and than obsess about dropping plenty of cash to rebuild stronger, so we can try to run it hard as hell and break again. We are sick individuals.

April 28th, 2007, 10:54 PM	#50
Dawgs2099 Regular 2000 Mustang GT Join Date: Apr 2007 Location: Westland,MI Posts: 51	The Motive proformance plus gears whine?? even though they state they dont?? Just wondering. Also what section in my Haynes manual would I look under to install this do hicky?

April 28th, 2007, 11:26 PM	#51
MustangMatt96GT I Post Entirely Way Too Much 1996 Mustang GT 14.631@93.51 @ 5800 FT Join Date: Dec 2006 Location: Lakewood, CO Posts: 6,958	Let a professional install! Otherwise morethan likely it will whine no matter what type of gears you get. Motives have just been known to whine if the install isnt perfect! Some installs will some wont! __________________ We expect shit to break, look foward to realizing exactly when it is happening, and than obsess about dropping plenty of cash to rebuild stronger, so we can try to run it hard as hell and break again. We are sick individuals.

May 1st, 2007, 08:42 PM	#52
DrHolliday Enthusiast Join Date: Mar 2007 Location: New Port, NC Posts: 710	All I ever hear about on this site is Ford racing gears, and Motive... Anyone ever hear anyhting good or bad abour genuine gears? __________________ Mustangless atm 2006 2500 HD Diesel.

May 4th, 2007, 02:25 AM	#53
cliffyk Regular Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 316	I've got about 1500 miles on my 3.73s now and find that I am getting 0.5 to 1.0 MPG less than with the stock 3.27 gears in my normal daily drive (50 miles each way, 15 miles at 45 to 70, 33 at 75-85, and the last 2 at 45-60; with only 10 traffic lights). 2500 rpm @ 80 mph. I'm pleased with the change, for the amount of driving I do (sometimes 400-500/day on interstates) I think the engine speed increase of 4.10s (2750 @ 80) would wear thin after a while... __________________ -cliff knight- My Mustang GT Multi-fuel: Burns gas and rubber...

May 21st, 2007, 12:06 AM	#54
chris1 Enthusiast 2003 Ford Mach Traveling at the speed of a photon Join Date: Feb 2007 Location: Los Angeles, California Posts: 690	now i have a 01 gt and if i go with 18 x 10.5 deep dish rims would 3.73's be good enough to feel the difference...keep in mind im a daily driver on highway. willing to take any suggestions __________________ Under my Umbrella! Studies show that 99.9% of the kids on MM ask the same questions over and over again about performance parts yet do nothing after the advice is given because they're still in Highschool and suffer from no money syndrome.

May 21st, 2007, 12:25 AM	#55
chris1 Enthusiast 2003 Ford Mach Traveling at the speed of a photon Join Date: Feb 2007 Location: Los Angeles, California Posts: 690	i actually meant 18 x 10 sorry..lol

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May 21st, 2007, 05:01 AM	#56
cliffyk Regular Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 316	As long as you do not change the outside diameter of the tires to something larger than stock (25.7") the diameter and width of the wheel have nothing to do with it (other than the added weight which requires more power to accelerate). As an update, I find that if I consistently cruise above 80 (85-90) the 3.73s can easily eat up another 2.0 MPG more than the OEM gears. I figure that overall, at current gas prices, the 3.73s are going to cost me about $550 more per year (I drive 45k or so per year). __________________ -cliff knight- My Mustang GT Multi-fuel: Burns gas and rubber...

May 21st, 2007, 01:29 PM	#57
chris1 Enthusiast 2003 Ford Mach Traveling at the speed of a photon Join Date: Feb 2007 Location: Los Angeles, California Posts: 690	now as stupid as this sounds..(sorry) but how do you change the diameter of the tires? do you mean the size in tires?? __________________ Under my Umbrella! Studies show that 99.9% of the kids on MM ask the same questions over and over again about performance parts yet do nothing after the advice is given because they're still in Highschool and suffer from no money syndrome.

May 21st, 2007, 03:57 PM	#58
cliffyk Regular Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 316	Tires sizes are specified as the tread width/aspect ratio-wheel diameter--the aspect ratio is the ratio of the sidewall height to the tread width, specified as a percentage... So, a 245/45-17 has a tread that's 245 mm wide, an aspect ratio of 45, and is meant for a 17" wheel. 245 * .45 = 110.25 mm, so we know the sidewall is 110.25 mm high, add the sidewal height * 2 to the wheel diameter and we find that this tire is 110.25 * 2 + 17 * 25.4 or 652.3 mm, or 25.68" which is pretty close to the 25.7" most manufacturers state. Now lets do a 275/40-17, 275 * .4 = 110 mm, 110 * 2 + 17 * 25.4 = 651.8 mm = 25.66" (again pretty close to 25.7"). OK, now let's do the math for a 225/45-17; 225 * .45 = 101.25 mm, so a 225/45-17 tire is going to have an outside diameter of (101.25 * 2 + 17 * 25.4) = 634.3 mm = 24.97" (25" is the quoted spec). That's how you change tire diameters--buy tires of a different diameter... __________________ -cliff knight- My Mustang GT Multi-fuel: Burns gas and rubber...

May 24th, 2007, 02:27 AM	#59
DCstangGT Regular 1999 Mustang GT 13.21@104.5 Join Date: Aug 2006 Location: Washington Posts: 239	What is the RPM at 60mph with 4.10 and with 3.73?

May 24th, 2007, 04:53 AM	#60
cliffyk Regular Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 316	60 in 5th: 3.27 rear = 1640 3.73 rear = 1870 4.10 rear = 2060 __________________ -cliff knight- My Mustang GT Multi-fuel: Burns gas and rubber...