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Old 10-25-2005, 08:51 PM   #1
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rear gears

whats the difference between the gears
2.27,3.37,4.10,4.30
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Old 10-26-2005, 03:46 PM   #2
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Re: rear gears

The smaller the number, the better the gas milage and worse excelleration.

IE: 3.27 (stock) has better gas milage than 4.10, but 4.10 has better acceleration than 3.27.

For naturally aspirated cars (manual) the 3.73's are probably a happy medium, for automatics everyone seems to favor 4.10's.

For boosted cars, stock gearing works fine.
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Old 10-26-2005, 04:28 PM   #3
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Re: rear gears

the numbers 2.73,3.27, and 3.73, etc are referrring to the ratio of teeth on the ring gear and the pinion gear, like 41 teeth on the ring gear and 11 teeth on the pinion is 3.73 gear ratio.
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Old 10-26-2005, 04:50 PM   #4
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Re: rear gears

Quote:
Originally Posted by DarkShadow
The smaller the number, the better the gas milage and worse excelleration.

IE: 3.27 (stock) has better gas milage than 4.10, but 4.10 has better acceleration than 3.27.
not really, when traveling on the streets going 35 you would probobly waste less gas than with 4.10's than with 2.73's. in the highwayyour theory becomes true.
3.73 dont have to be had on manuals. 4.10's you can have on a manual but you will have to be shifting quite fast. also if you want good highway gas mialege you could also put 3.73's in an automatic.
depending on your setup boosted cars can also run3.55's
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Old 10-26-2005, 05:48 PM   #5
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Re: rear gears

Every full turn of the rear tires is X.XX turns of the drive shaft. That means with 3.73 gears the drive shaft turns 3.73 times for every full turn of the rear wheels. That means you accelerate quicker, but it takes more energy to keep the car going at a constant speed vs say 2.73 gears. The higher the gear the easier it is for the car to start moving, but the lower the top speed of the car will be, takes more RPM's to turn the drive shaft faster to get the tires moving.

Basically if you have an auto sell the car adn buy a manual or run 4.10 gears, if you have a manual go with 3.73.
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Old 10-26-2005, 06:59 PM   #6
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Re: rear gears

slright thanks i have a manual so you guys recommend the 3.37 instead of the 4.10 so the higher the less top speed
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Old 10-26-2005, 08:07 PM   #7
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Re: rear gears

Quote:
Originally Posted by tim11
slright thanks i have a manual so you guys recommend the 3.37 instead of the 4.10 so the higher the less top speed
3.73 but 4.10s won't be that bad
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Old 10-26-2005, 08:38 PM   #8
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Re: rear gears

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Originally Posted by tim11
slright thanks i have a manual so you guys recommend the 3.37 instead of the 4.10 so the higher the less top speed
do you tink you will ever go with forced induction?
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Old 10-26-2005, 09:16 PM   #9
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Re: rear gears

Quote:
Originally Posted by 232stang
not really, when traveling on the streets going 35 you would probobly waste less gas than with 4.10's than with 2.73's. in the highwayyour theory becomes true.
3.73 dont have to be had on manuals. 4.10's you can have on a manual but you will have to be shifting quite fast. also if you want good highway gas mialege you could also put 3.73's in an automatic.
depending on your setup boosted cars can also run3.55's
Hence my wording: "Happy medium" and "will work".
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Old 10-26-2005, 09:23 PM   #10
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Re: rear gears

what i want is a quick take off at the line
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Old 10-26-2005, 09:24 PM   #11
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Re: rear gears

Quote:
Originally Posted by tim11
what i want is a quick take off at the line
Do you do a lot of highway driving?

If not go 4.10s
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Old 10-26-2005, 10:05 PM   #12
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Re: rear gears

Quote:
Originally Posted by DarkShadow
Hence my wording: "Happy medium" and "will work".
any of the ratios will work, but some work better than other.
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Old 10-26-2005, 11:40 PM   #13
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Re: rear gears

what i wanna know is which works best on take off and
how come you asked if i drive on highway and if not to get the 4.10's if i get 4.10 it will reduce the top speed
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Old 10-26-2005, 11:42 PM   #14
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Re: rear gears

Quote:
Originally Posted by tim11
what i wanna know is which works best on take off and
how come you asked if i drive on highway and if not to get the 4.10's if i get 4.10 it will reduce the top speed
No but your gas mileage will suffer with 4.10s and constent highway speeds.

The gearing really depends on where your peak power is.

You do not want to enter and leave your powerband to quickly nor do you want to stay there too long either.

4.10s should be fine for you, but if you drive on the interstate your gas mileage will suffer since you will be turning higher rpms
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Old 10-28-2005, 02:10 PM   #15
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Re: rear gears

so what do 4.10's do different than 3.73 which are better on take off
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Old 10-28-2005, 03:31 PM   #16
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Re: rear gears

the higher the gear ratio basically the faster you accelerate. so 4.10s would have a better jump off the line but 3.73s would have good acceleration but would be more drivable off the track. unless you dont mind losing a few miles to the gallon (maybe not even) and layin alittle rubber at stop signs haha jk.
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Old 10-28-2005, 08:00 PM   #17
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Re: rear gears

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Originally Posted by wiarumas
the higher the gear ratio basically the faster you accelerate. so 4.10s would have a better jump off the line but 3.73s would have good acceleration but would be more drivable off the track. unless you dont mind losing a few miles to the gallon (maybe not even) and layin alittle rubber at stop signs haha jk.
so the 4.10 would'nt affect my top speed
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Old 10-29-2005, 08:01 PM   #18
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Re: rear gears

i do quite a bit of highway driving, but i want to still get decent gas mileage, but still want a better takeoff. should i go with 3.73?? i have an auto though. i also plannin on getting t-lock when i get the gears.
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Old 10-29-2005, 08:25 PM   #19
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Re: rear gears

Quote:
Originally Posted by OXstang11
i do quite a bit of highway driving, but i want to still get decent gas mileage, but still want a better takeoff. should i go with 3.73?? i have an auto though. i also plannin on getting t-lock when i get the gears.
I currently have 3.73's and they are very good for takeoff and mileage. Remember this the bad mileage number is 3000 RPM at 3000 RPM your mileage takes a tank. If you stay within the speed limit 4.10's are OK but if you travel the interstates around 75-80 like I do your mileage will sux.

So if you are not a big interstate traveler and go to the track often get 4.10's But if you travel interstates and dont go to the track much or at all then I would go with 3.73's
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Old 10-30-2005, 02:04 PM   #20
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Re: rear gears

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Originally Posted by Danger Dude
I currently have 3.73's and they are very good for takeoff and mileage. Remember this the bad mileage number is 3000 RPM at 3000 RPM your mileage takes a tank. If you stay within the speed limit 4.10's are OK but if you travel the interstates around 75-80 like I do your mileage will sux.

So if you are not a big interstate traveler and go to the track often get 4.10's But if you travel interstates and dont go to the track much or at all then I would go with 3.73's
ok, well for the next few years i will be a big interstate traveler, so i am thinking about going with the 3.73's. i'm just looking at giving my car a little more get up and go then stock, nothing to much.
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Old 10-30-2005, 04:06 PM   #21
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Re: rear gears

i am thinking of a 3.55 or 3.73 a 4.10 rear end would be nice but there goes the gas milage
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Old 10-30-2005, 06:12 PM   #22
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Re: rear gears

i found a site that has the 8.8 rear ends but i gotta check up on them on monday its better if i get the 8.8 rear with everything right they give me this options any sugestions on which i should go with if you can make a list of what i should go with to help me out i want to go with the 3.73 but which ones should i go with thanks

1 - RING & PINION

$150.00 ACCU VALUE GEAR - 3.08 RATIO RING & PINION GEARSET

$150.00 ACCU VALUE GEAR - 3.27 RATIO RING & PINION GEARSET

$112.50 ACCU VALUE GEAR - 3.55 RATIO RING & PINION GEARSET

$112.50 ACCU VALUE GEAR - 3.73 RATIO RING & PINION GEARSET

$112.50 ACCU VALUE GEAR - 4.10 RATIO RING & PINION GEARSET

$112.50 ACCU VALUE GEAR - 4.56 RATIO RING & PINION GEARSET

$155.00 MOTIVE GEAR - 3.08 RATIO RING & PINION GEARSET

$155.00 MOTIVE GEAR - 3.27 RATIO RING & PINION GEARSET

$209.25 MOTIVE GEAR - 3.31 RATIO RING & PINION GEARSET

$142.60 MOTIVE GEAR - 3.55 RATIO RING & PINION GEARSET

$142.60 MOTIVE GEAR - 3.73 RATIO RING & PINION GEARSET

$142.60 MOTIVE GEAR - 4.10 RATIO RING & PINION GEARSET

$142.60 MOTIVE GEAR - 4.56 RATIO RING & PINION GEARSET

$310.74 MOTIVE PERFORMANCE - 3.08 RATIO RING & PINION GEARSET

$282.49 MOTIVE PERFORMANCE - 3.27 RATIO RING & PINION GEARSET

$202.28 MOTIVE PERFORMANCE - 3.31 RATIO RING & PINION GEARSET

$202.28 MOTIVE PERFORMANCE - 3.55 RATIO RING & PINION GEARSET

$202.28 MOTIVE PERFORMANCE - 3.73 RATIO RING & PINION GEARSET

$244.13 MOTIVE PERFORMANCE - 3.90 RATIO RING & PINION GEARSET

$202.28 MOTIVE PERFORMANCE - 4.10 RATIO RING & PINION GEARSET

$244.13 MOTIVE PERFORMANCE - 4.30 RATIO RING & PINION GEARSET

$280.19 MOTIVE PERFORMANCE - 4.33 RATIO RING & PINION GEARSET

$202.28 MOTIVE PERFORMANCE - 4.56 RATIO RING & PINION GEARSET

$244.13 MOTIVE PERFORMANCE - 4.88 RATIO RING & PINION GEARSET

$244.13 MOTIVE PERFORMANCE - 5.14 RATIO RING & PINION GEARSET

$244.13 MOTIVE PERFORMANCE - 5.71 RATIO RING & PINION GEARSET

$244.13 MOTIVE PERFORMANCE - 6.14 RATIO RING & PINION GEARSET

$200.00 PRECISION GEAR - 3.08 RATIO RING & PINION GEARSET

$200.00 PRECISION GEAR - 3.55 RATIO RING & PINION GEARSET

$200.00 PRECISION GEAR - 3.73 RATIO RING & PINION GEARSET

$200.00 PRECISION GEAR - 4.10 RATIO RING & PINION GEARSET

$248.00 PRECISION GEAR - 4.30 RATIO RING & PINION GEARSET

$216.00 PRECISION GEAR - 4.56 RATIO RING & PINION GEARSET

$248.00 PRECISION GEAR - 4.88 RATIO RING & PINION GEARSET

$248.00 PRECISION GEAR - 5.13 RATIO RING & PINION GEARSET

$228.00 RICHMOND GEAR - 3.55 RATIO RING & PINION GEARSET

$228.00 RICHMOND GEAR - 3.73 RATIO RING & PINION GEARSET

$248.00 RICHMOND GEAR - 4.10 RATIO RING & PINION GEARSET

$248.00 RICHMOND GEAR - 4.33 RATIO RING & PINION GEARSET

$248.00 RICHMOND GEAR - 4.56 RATIO RING & PINION GEARSET

$261.33 RICHMOND GEAR - 4.88 RATIO RING & PINION GEARSET

$226.20 YUKON GEAR - 2.73 RATIO RING & PINION GEARSET

$210.25 YUKON GEAR - 3.08 RATIO RING & PINION GEARSET

$238.24 YUKON GEAR - 3.27 RATIO RING & PINION GEARSET

$210.25 YUKON GEAR - 3.31 RATIO RING & PINION GEARSET

$181.25 YUKON GEAR - 3.55 RATIO RING & PINION GEARSET

$178.35 YUKON GEAR - 3.73 RATIO RING & PINION GEARSET

$210.25 YUKON GEAR - 3.90 RATIO RING & PINION GEARSET

$210.25 YUKON GEAR - 4.11 RATIO RING & PINION GEARSET

$210.25 YUKON GEAR - 4.30 RATIO RING & PINION GEARSET

$181.25 YUKON GEAR - 4.56 RATIO RING & PINION GEARSET

$181.25 YUKON GEAR - 4.88 RATIO RING & PINION GEARSET

$234.90 YUKON GEAR - 5.13 RATIO RING & PINION GEARSET

$212.12 YUKON GEAR - 5.71 RATIO RING & PINION GEARSET

$210.25 YUKON GEAR - 6.14 RATIO RING & PINION GEARSET

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$29.95 MINOR INSTALL KIT

$4.00 PATTERN CHECKING GREASE

$2.40 THREAD LOCKING LIQUID

3 - DIFFERENTIAL

$691.17 ARB SELECTABLE AIR LOCKER

$585.42 AUBURN GEAR - ECTED SELECTABLE LOCKER & LIMITED-SLIP DIFFERENTIAL

$343.03 AUBURN GEAR - HIGH PERFORMANCE LIMITED-SLIP DIFFERENTIAL

$424.64 AUBURN GEAR - PRO SERIES LIMITED-SLIP DIFFERENTIAL

$536.26 DETROIT LOCKER

$628.01 EATON - ELOCKER SELECTABLE LOCKING DIFFERENTIAL

$388.59 EATON - POSI LIMITED-SLIP DIFFERENTIAL

$118.58 MINI SPOOL - 28 SPLINE - C-CLIP COMPATIBLE - STEEL

$47.09 MODIFIED CROSS SHAFT

$271.19 ORIGINAL STYLE POSI - COMPLETE

$49.88 POSI CLUTCH PACK KIT - FACTORY/FMS/FRP POSI

$323.92 POWERTRAX - LOCK-RIGHT LOCKER - FITS IN FACTORY NON-POSI CASE

$401.45 POWERTRAX - NO-SLIP LOCKER - FITS IN FACTORY NON-POSI CASE

$427.97 POWERTRAX - NO-SLIP LOCKER - FITS IN FACTORY POSI CASE

$382.32 TRUTRAC LIMITED-SLIP

4 - AXLE SHAFT

$161.19 STANDARD AXLE SHAFT - DRIVER OR PASSENGER SIDE - 30-3/4 inch - 5-4.50 LUG - 28 SPLINE - 1.4 BEARING SURFACE DIA. - 7.5 & 8.8 LR ABS

5 - OIL & ADDITIVE

$10.85 FULL SYNTHETIC GEAR OIL - QUART 75W-140 GL-6

$3.41 POSI ADDITIVE - TYPE F

$3.41 POSI ADDITIVE - TYPE G

6 - TOOLS

$30.00 .001inch-1inch PRECISION BACKLASH DIAL INDICATOR

$40.00 .001inch-6inch PRECISION SHIM ADJUSTMENT DIAL CALIPERS

$15.00 ADJUSTABLE MAGNETIC BASE FOR DIAL INDICATOR

$80.00 COMPLETE MEASURING KIT - WITH MAGNETIC BASE - DIAL INDICATOR AND DIAL CALIPERS

$34.95 DIFFERENTIAL LOCKSHAFT PIN REMOVAL TOOL - USE WITH MOST THREADED DIFFERENTIAL PINS - REMOVES BROKEN PINS

$34.75 MECHANIX M-PACT 2 GLOVES

$30.41 MECHANIX M-PACT GLOVES

$21.74 MECHANIX ORIGINAL STYLE GLOVES

$26.05 MECHANIX WEAR COLD WEATHER GLOVES

$59.95 TECHNICAL VIDEO SERIES - RING & PINION, DIFFERENTIAL & AXLE INSTALLATION AND COMPLETE REBUILDING

$198.25 YUKON TOOLS - ADD ON BIG BEARING KIT FOR BEARING PULLER

$381.13 YUKON TOOLS - ULTIMATE BEARING PULLER

7 - DIFF COVER

$31.53 CHROME DIFFERENTIAL COVER

$149.95 CLEAR GEARZ - CLEAR SEE-THRU COVER

$159.00 TA DIFFERENTIAL COVER AND CAP GIRDLE

9 - DRIVESHAFT

$19.00 DRIVESHAFT U-JOINTS - REAR DRIVESHAFT - 2 JOINT STYLE

BEARING KIT

$63.58 INTERNAL BEARING KIT

$25.95 REAR AXLESHAFT BEARING AND SEAL KIT

BEARINGS

$15.95 AXLE BEARING

$14.95 AXLE BEARING - CAR

$11.95 DIFFERENTIAL CASE BEARING

$6.95 DIFFERENTIAL CASE BEARING RACE

$15.95 INNER PINION BEARING

$7.95 INNER PINION BEARING RACE

$12.95 OUTER PINION BEARING

$5.95 OUTER PINION BEARING RACE

SEALS

$4.95 AXLE BEARING SEAL

$3.95 AXLE BEARING SEAL - CAR

$17.95 PINION SEAL

YOKE

$181.77 PINION YOKE - 30 SPLINE - 1350 SERIES - FORD 8.8 inch

$32.58 PINION YOKE - FLAT FLANGE - 28 SPLINE - 1.470 MEASURE U-JOINT CENTER TO END

$3.63 U-BOLT KIT FOR 1350 SERIES YOKES
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Old 10-30-2005, 09:05 PM   #23
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Re: rear gears

Quote:
Originally Posted by OXstang11
ok, well for the next few years i will be a big interstate traveler, so i am thinking about going with the 3.73's. i'm just looking at giving my car a little more get up and go then stock, nothing to much.
go with the 3.73's then. If you still want more get up, theres more you can do then just rear gears. the only limit is your budget.
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Old 10-30-2005, 09:56 PM   #24
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Re: rear gears

Quote:
Originally Posted by tim11
so the 4.10 would'nt affect my top speed
Yes it would.
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Old 10-30-2005, 10:17 PM   #25
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Re: rear gears

Quote:
Originally Posted by DarkShadow
Yes it would.
No it won't... I can and have done 130mph in my stock V6 Mustang with my 4.10's, don't believe me... ask n8r
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Old 10-30-2005, 10:21 PM   #26
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Re: rear gears

But doesn't it at least take a lot longer...?
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Old 10-30-2005, 10:24 PM   #27
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Re: rear gears

Quote:
Originally Posted by DarkShadow
But doesn't it at least take a lot longer...?
Well... before that I couldnt go past 117mph so I couldnt tell you.... I dont think it takes longer....


I think it takes longer with 2.73 gears because once you get above 100mph with 2.73 gears you start losing a lot of ummph
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Old 10-30-2005, 10:25 PM   #28
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Re: rear gears

Quote:
Originally Posted by Brent
No it won't... I can and have done 130mph in my stock V6 Mustang with my 4.10's, don't believe me... ask n8r
If you dont remove your speed limiter you wont do 90mph. I have 3.73's and have bust 135mph on several occasions

The fact is who the hell cares about to speed. Unless you have a runway like I do to run down or are going to be involved in Land Speed Racing going 130 in a street car is not that practical 15-120 is max speed of a stock Mustang anyway with the speed limiter
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Old 10-30-2005, 10:29 PM   #29
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Re: rear gears

Yeah that's true 'cause you get a lot of initial umph with the 4.10's, but out of about ten people I know of with 4.10's, they said that, at the very least it took them longer to get up to top speed, and others said they probably could have but it would have taken too long and they didn't want to run their car that hard for that long...after my chip, mine still pulled REALLY hard up to 130 (I think, I have stock gauges) with stock gearing and felt like I could have gone a decent bit higher but didn't want to be too reckless...
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Old 10-30-2005, 10:29 PM   #30
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Re: rear gears

Quote:
Originally Posted by Brent
I think it takes longer with 2.73 gears because once you get above 100mph with 2.73 gears you start losing a lot of ummph
You are exactly correct Brent. higher the gear number the faster you climb in speed the lower the gear the slower you climb in speed.
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Old 10-30-2005, 10:31 PM   #31
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Re: rear gears

I'd love to put new gears in mine...but can't justify doing it without beefing up the rear somehow. And that costs more than I can afford at the moment
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Old 10-30-2005, 10:34 PM   #32
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Re: rear gears

Quote:
Originally Posted by Danger Dude
You are exactly correct Brent. higher the gear number the faster you climb in speed the lower the gear the slower you climb in speed.
Yeah, that's what I was always thinking when they were telling me that, 'cause I would "reminisce" back to my days of peddling a bicycle, you go up to a bigger gear to make it easier to peddle faster because you could only peddle so fast because your not really getting any resistence...

I wonder why they were saying that unless they never really got up that fast before they changed gears...?
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Old 10-30-2005, 11:01 PM   #33
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Re: rear gears

Quote:
Originally Posted by lowflyn
I'd love to put new gears in mine...but can't justify doing it without beefing up the rear somehow. And that costs more than I can afford at the moment

Beef up what???? The 7.5 is more than capable of surviving in your car.
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Old 10-30-2005, 11:02 PM   #34
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Re: rear gears

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Originally Posted by Danger Dude
If you dont remove your speed limiter you wont do 90mph. I have 3.73's and have bust 135mph on several occasions

The fact is who the hell cares about to speed. Unless you have a runway like I do to run down or are going to be involved in Land Speed Racing going 130 in a street car is not that practical 15-120 is max speed of a stock Mustang anyway with the speed limiter
I know just stating it will not hurt his top speed
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Old 10-31-2005, 03:30 AM   #35
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Re: rear gears

the 7.5 will be fine but upgrading should be done if you plan on doing more later.

as for the top speed.. i thought it did at once too but i was told otherwise just as you have been. it affects the acceleration at top speed, but doesnt decrease it.
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