rear gears and gas mileage

February 3rd, 2007, 03:18 AM	#1
punkafi888 Regular Join Date: Jan 2007 Posts: 294	rear gears and gas mileage i was just wondering what the difference in gas miles would be with say a 3 - 4.10. i drive mostly stop light to stop light. a highway every year or so. lol but i am getting ready for a big drag and all i got is my good old stang. so why not race her out!

February 3rd, 2007, 03:22 AM

232stang

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the gas mileage difference between (im assuming) 3.73 and 4.10 gears is so minute that it shouldnt matter. especially if you dont do highway alot. if you want to get the most out of it but stay streetable definetly go 4.10's. if your like me, i drive 300+ highway miles a week, im getting 3.73s.

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Originally Posted by Cesar2cool

lol i use my car for speed

February 3rd, 2007, 04:44 AM	#3
Stang6899 Hardcore Enthusiast Modded V6 Join Date: Sep 2006 Location: Mukilteo WA Posts: 1,124	Meh I'm going 3.73's because A. I drive a manual, and B. They're like $50 from mpsautosalvage :] __________________ 1999 v6 5spd- CAI, dual exhaust, spec stage 1 clutch, P&P heads and intakes, aluminum driveshaft, short shifter, 4.10 gears, auburn posi, SCT tuned 2001 SVT Cobra- SLP x-pipe, Borla Catback

February 3rd, 2007, 06:24 PM

AtlanticBlue99

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Re: rear gears and gas mileage

Originally Posted by punkafi888

i was just wondering what the difference in gas miles would be with say a 3 - 4.10. i drive mostly stop light to stop light. a highway every year or so. lol but i am getting ready for a big drag and all i got is my good old stang. so why not race her out!

b/w 3.73:1 and 4.10:1, the mpg is not noticeable for varied conditions. from stock to 4.10s, my highway rpms changed as so:

70mph stock = 60mph 4.10s
or 2400 rpms was 70 stock, now 2400 rpms is 60, and 75mph is at 3k rpms on the nose.

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February 4th, 2007, 02:06 AM	#5
94pacecarSVT Enthusiast 1996 Mustang GT 11.2@122.36 Join Date: Aug 2006 Location: North Carolina Posts: 530	i have some questions about gears too so hey why not post here. im putting an 8.8 inch gt rear end into my 96 sixer because a guy at custom performance told me that if im going to be putting gears and a lot of other mods on it and im gonna be using it at the strip or road racing it a lot, then i need a stronger rear end, or the harsh driving will tear it out. the rear end he's gonna put in it for me comes with 3.73's and a posi-trak. should i stick with the 3.73's or put 4.10's in? and how big is the difference in exceleration from 3.73 to 4.10's?

February 4th, 2007, 01:07 PM

AtlanticBlue99

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1999 Ford Mustang V6

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Originally Posted by 99stangv6

i have some questions about gears too so hey why not post here. im putting an 8.8 inch gt rear end into my 96 sixer because a guy at custom performance told me that if im going to be putting gears and a lot of other mods on it and im gonna be using it at the strip or road racing it a lot, then i need a stronger rear end, or the harsh driving will tear it out. the rear end he's gonna put in it for me comes with 3.73's and a posi-trak. should i stick with the 3.73's or put 4.10's in? and how big is the difference in exceleration from 3.73 to 4.10's?

the math to the applied torque can be found in this article.

my 7.5 rear holds up fine with an auto tranny and drag radials. if you launched from 5k rpms with slicks, you will more than likely break it, but the 28 splines in the 8.8 are not going to be good race axles either. look into 31 spline mosers if you are planning on serious power.

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February 4th, 2007, 01:37 PM	#7
94pacecarSVT Enthusiast 1996 Mustang GT 11.2@122.36 Join Date: Aug 2006 Location: North Carolina Posts: 530	he recommended this because mines a manual.

February 4th, 2007, 01:42 PM

AtlanticBlue99

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1999 Ford Mustang V6

14.79 @ 92.15

Join Date: Aug 2005

Location: UGA

Posts: 8,251

Originally Posted by 99stangv6

he recommended this because mines a manual.

an 8.8 with 31 spline axles and 4.10s would be ideal for v6 power on the strip. what axles and differential unit are in the rear he wants to install?

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February 4th, 2007, 03:35 PM	#9
itschristorres8 SP00LIN V6 2000 Mustang V6 unknown @390 Join Date: Aug 2006 Location: south florida Posts: 14,619	really when it comes down to gear choice this is wat makes or brakes your choice down future mods, type of driving its used for MOST if you plan on modding the hell out of your car depending on what mad you get, turbo, nitrous, s/c, everything but FI..all will vary if you can open up the rpm range more and you race alot 4.10s i would say isnt even the choice, 4.30 or 4.56 if your conna be racing on a n/a car with or with out nitrous. if your just gonna eventually through on a s/c or turbo on there, and not upgrading the internals, heads or cam. i wouldnt get 4.10 or high 3.90 or 3.73s __________________ 437rwhp and 402rwtq through a V6 on a stock bottom end

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