3.73 gears

roundeye82 · 11-20-2003, 02:29 PM

I have the factory 3.27 gears in my 03 GT (5 speed). I am wanting to go with a 3.73 setup. What would be the difference in rpms in 5th gear at 55 mph? 65 mph? 75 mph? Will it make my car feel like it is in the powerband longer moreso than with the 3.27 gears? Also will it make my 1st gear super low? Any feedback is much appreciated.

surfbeast · 11-20-2003, 04:10 PM

Not sure about the rpms but I don't think you will notice any BIG difference at all.

GTvert · 11-20-2003, 04:56 PM

Not sure about the 3.73s, but with my 4.10s, I'm around 3200rpms@ 75 . I still get over 20 mpg on the hwy. First gear won't be real low with 3.73s.You will notice a difference over the 3.27s, but ,personally, I like the 4.10 gear better.

Titan · 11-21-2003, 03:06 PM

I know there's an equation somewhere that will tell you all that, I just can't remember what it is. At 80 mph, I'm running around 2900 rpms...not sure about the other speeds. I rarely ever used first gear, unless I'm on a hill or wanting to get going. I get 300+ miles to the tank, too, so I'm above 20mpg. However, I drive 70 miles/day on the interstate and my speedometer is a little off. It says I'm doing about 7-10 mph over what I'm actually going, so it throws off my odometer. You'll notice some difference, but nothing real big. My dad has 3.55 in his and I can tell a difference b/w the two, but it's minimal.

Morgstang · 11-22-2003, 12:34 PM

It is about a 400 rpm increase from 3:23's to 3:73's. At 70 mph your will be at 2200 rpm as opposed to 1800. And YES you do feel more pull as compared to stock. 1st gear isnt as bad as you think it will be, it wont act like a granny gear. My fuel mileage dropped in town but on highway i get 27 mpg. Hope that helps.

Red Mustang Gt 46 · 11-23-2003, 10:05 AM

3:73's are perfect for the SOHC4.6...You will notice a difference.

xxxBlakexxx · 11-23-2003, 12:36 PM

Hey guys! All the answers are right here at your finger tips. Go to the site map and click on "Analyzer". Scroll down to the bottom. You can pick any combo of gear ratios and tire diameter you want and you will get all the data that you need and then some.

Don't forget, the higher the gear ratio number, the higher the rpm's you will run and the more fuel you will comsume. The guys that are reporting same fuel economy are getting these results because they are probably using a higher gear more often then they were before because the car pulls better than with stock gears. So, overall, they must still be running at about the same average RPMs.

Also, your top speed will decrease almost 20 mph from stock gears to 4.10s if you care. This might be an issue if you are a bank robber and are planning to outrun the law.

blue00gt · 11-24-2003, 02:59 PM

With 4.10s I only lost 1 mpg on average. Also, if you have a pretty much stock motor, your top speed will increase with 4.10s, not decrease because it will put you in the power band in 5th. I think 3.73s are a little weak for '99+ cars - if you look at where they make peak power the 4.10 is the best gear for acceleration. 3.73s are more optimal for a fairly stock '96-98 and 5.0s because they make peak power lower in the rev range.

95mustanggt · 11-24-2003, 10:34 PM

I have to agree with some what was said. My 2002 GT pulls way better up top. My 95 (with 3.73's) pulls hard but starts to die out between 4500 and 5000 RPM. My 2002 GT, is still gaining power at 4500 RPM. Unless you're going to be doing a lot of highway miles, I'd go 4.10's.

I noticed an increase in fuel economy in town with 3.73's in my 95. Obviously highway mileage suffered some.

ac97gt · 11-29-2003, 01:48 AM

Quote:

Originally posted by Morgstang
It is about a 400 rpm increase from 3:23's to 3:73's. At 70 mph your will be at 2200 rpm as opposed to 1800. And YES you do feel more pull as compared to stock. 1st gear isnt as bad as you think it will be, it wont act like a granny gear. My fuel mileage dropped in town but on highway i get 27 mpg. Hope that helps.

hmm, i bought my car used, but i have no reason to believe (only mod when i got it was flowmaster mufflers, not even an aftermarket pipe) that i have different gears (door tag says 3.27)... i never checked by jacking up the rear end, but im at 2200rpm almost exactly at exactly 70mph... im at about 2500rpm at 80mph...

explicitone · 11-29-2003, 05:21 AM

I say if your looking for the bang for thebuck go with 4.10s I would have been kicking myself if I went with 3.73s if I was not going to spray I would have gone with 4.30s

explicitone · 11-29-2003, 04:15 PM

Quote:

Originally posted by Red Mustang Gt 46
3:73's are perfect for the SOHC4.6...You will notice a difference.

3.73s are perfect for a daily driver blown sohc\(but not enough for a n/a motor)
4.10s are perfect for a daily driver blown and raced sohc
4.30s are perfect for a street/strip n/a sohc

explicitone · 11-29-2003, 04:20 PM

Quote:

Originally posted by xxxBlakexxx

Also, your top speed will decrease almost 20 mph from stock gears to 4.10s if you care. This might be an issue if you are a bank robber and are planning to outrun the law.

yes it drops the top speed a little but if you use one of the cal. you will see a stock or even a 350 rwhp stangs wont be able to run a full top speed of 3.27 but the with 4.10s the car will top out higher then the 3.27s because to allows to use the power band in 5th where the 3.27s would not because of the lack of gear

top speed tr-3650 w/ 3.27s 205mph(stock stang will never see)
top speed t-45 w/ 3.27s 209mph(stock stang will never see)

top speed tr-3650 w/ 4.10s 165mph(mildly modded stang can reach)

top speed t-45 w/4.10s 170mph(mildly modded stang can reach)

11-20-2003, 02:29 PM	#1
roundeye82 Registered Member Join Date: Jun 2003 Location: Tioga, LA Posts: 20	3.73 gears I have the factory 3.27 gears in my 03 GT (5 speed). I am wanting to go with a 3.73 setup. What would be the difference in rpms in 5th gear at 55 mph? 65 mph? 75 mph? Will it make my car feel like it is in the powerband longer moreso than with the 3.27 gears? Also will it make my 1st gear super low? Any feedback is much appreciated.

11-20-2003, 04:10 PM	#2
surfbeast Registered Member Join Date: Feb 2002 Location: Maryville,TN Posts: 415	Not sure about the rpms but I don't think you will notice any BIG difference at all. __________________ 98 GT / convertable -98 Saleen engine, Saleen appearance pkg. SHM cams,P&P NPI heads, and so much more!

11-20-2003, 04:56 PM	#3
GTvert Registered Member Join Date: Apr 2003 Location: West Plains Posts: 74	Not sure about the 3.73s, but with my 4.10s, I'm around 3200rpms@ 75 . I still get over 20 mpg on the hwy. First gear won't be real low with 3.73s.You will notice a difference over the 3.27s, but ,personally, I like the 4.10 gear better. __________________ Slower Traffic Keep Right

11-21-2003, 03:06 PM	#4
Titan Registered Member Join Date: Jul 2002 Location: Atlanta Posts: 296	I know there's an equation somewhere that will tell you all that, I just can't remember what it is. At 80 mph, I'm running around 2900 rpms...not sure about the other speeds. I rarely ever used first gear, unless I'm on a hill or wanting to get going. I get 300+ miles to the tank, too, so I'm above 20mpg. However, I drive 70 miles/day on the interstate and my speedometer is a little off. It says I'm doing about 7-10 mph over what I'm actually going, so it throws off my odometer. You'll notice some difference, but nothing real big. My dad has 3.55 in his and I can tell a difference b/w the two, but it's minimal. __________________ Current Sophomore -- Mechanical Engineering Black on Black 98' GT 5-Speed Mods = Stuff

11-23-2003, 10:05 AM	#6
Red Mustang Gt 46 13.3 @ 103 Join Date: May 2001 Location: Maryland Posts: 253	3:73's are perfect for the SOHC4.6...You will notice a difference. __________________ Equipment by: Steeda C&L COMP CAMS FRPP MSD Bassani Magnaflow MAC

11-22-2003, 12:34 PM	#5
Morgstang Registered Member Join Date: May 2003 Location: Texas Posts: 12	It is about a 400 rpm increase from 3:23's to 3:73's. At 70 mph your will be at 2200 rpm as opposed to 1800. And YES you do feel more pull as compared to stock. 1st gear isnt as bad as you think it will be, it wont act like a granny gear. My fuel mileage dropped in town but on highway i get 27 mpg. Hope that helps.

11-23-2003, 12:36 PM	#7
xxxBlakexxx Registered Member Join Date: Sep 2003 Location: Mountaintop, PA Posts: 634	Hey guys! All the answers are right here at your finger tips. Go to the site map and click on "Analyzer". Scroll down to the bottom. You can pick any combo of gear ratios and tire diameter you want and you will get all the data that you need and then some. Don't forget, the higher the gear ratio number, the higher the rpm's you will run and the more fuel you will comsume. The guys that are reporting same fuel economy are getting these results because they are probably using a higher gear more often then they were before because the car pulls better than with stock gears. So, overall, they must still be running at about the same average RPMs. Also, your top speed will decrease almost 20 mph from stock gears to 4.10s if you care. This might be an issue if you are a bank robber and are planning to outrun the law. __________________ "Children should not get cancer, but they do!" Help a child with cancer at www.homeoftheirown.org My Stang: 2000 Mustang GT Vert - Steeda Tri-Ax Shifter; C&L Plenum; BBK 75 mm TB; Steeda Strut Tower Supports; Black "Deep Dish" Bullet Wheels; FRPP 4.10's; Steeda Subframes; SLP Catback & SLP Catted X-Pipe; SCT 4 Position Chip with 3 custom tunes; Steeda CAI; Venom-1000 Nitrous; Roush Stage 3 Body Kit; Bullet Suspension Package (on the way)

11-24-2003, 02:59 PM	#8
blue00gt Mustang Addict Join Date: Jan 2001 Location: McKinney, TX Posts: 1,294	With 4.10s I only lost 1 mpg on average. Also, if you have a pretty much stock motor, your top speed will increase with 4.10s, not decrease because it will put you in the power band in 5th. I think 3.73s are a little weak for '99+ cars - if you look at where they make peak power the 4.10 is the best gear for acceleration. 3.73s are more optimal for a fairly stock '96-98 and 5.0s because they make peak power lower in the rev range. __________________ Strike down the unroadworthy! 2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more '94 Rio Red Cobra: All the bolt-ons, 3.73s

11-24-2003, 10:34 PM	#9
95mustanggt Registered Member Join Date: May 2000 Location: Kamloops, BC Posts: 2,875	I have to agree with some what was said. My 2002 GT pulls way better up top. My 95 (with 3.73's) pulls hard but starts to die out between 4500 and 5000 RPM. My 2002 GT, is still gaining power at 4500 RPM. Unless you're going to be doing a lot of highway miles, I'd go 4.10's. I noticed an increase in fuel economy in town with 3.73's in my 95. Obviously highway mileage suffered some. __________________ 1995 Mustang GT 20016 F150 Lariat Super Crew

11-29-2003, 05:21 AM	#11
explicitone Registered Member Join Date: Apr 2002 Location: racine ,wi Posts: 691	I say if your looking for the bang for thebuck go with 4.10s I would have been kicking myself if I went with 3.73s if I was not going to spray I would have gone with 4.30s __________________ RUN IT STAIGHT AND RUN IT HARD ________ Novi 2000 60' 1.46 1/4 10.67 mph 126.5 _________

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