4.10's & Gas Mileage

Toppchef · 09-03-2002, 10:40 PM

For all you 4.10 guys out there: I'm wondering what kind of gas mileage you all are getting? My car is basically stock (flows & FIPK), so I would like to get an idea for a mostly stock automatic 2000 GT. One more question: why are 4.10's better for an automatic than a stick?

StoplightWarrior · 09-04-2002, 02:50 AM

You will lose 4-5mpg

with 4.10s. Sitting in the fast lane on the freeway you will be cruising at 2900-3100. You will love the around town getup, but when you hit it from a roll on the freeway, you wont have much to work with. If I could do it over, I wouldnt put the gears in my GT....Instead, I'd save for a blower. Please, if you can afford it, heed my warning!

Titan · 09-04-2002, 06:40 AM

You would go blower before gears?? Hmmm...I dunno. You're the expert, but I would recommend for lower budgets to get the gears. Stoplight, don't you still need gears even after the blower?

Mustang92 · 09-04-2002, 10:07 AM

I went from 20 MPG to 19MPG in the city and 27.5 MPG to 27 MPG on the freeway with 4.10's. It's not nearly that much of a difference.

Bill

StoplightWarrior · 09-04-2002, 01:19 PM

Quote:

Originally posted by Mustang92
I went from 20 MPG to 19MPG in the city and 27.5 MPG to 27 MPG on the freeway with 4.10's. It's not nearly that much of a difference.

Bill

Bill, you have a stick, toppchef and I have autos. In the cobra, with the 3.73's, I didnt notice any loss in MPG...in the GT, I did lose 4mpg. I dont know what else to say, that's the case.

Titan: With an auto, if you go with gears, and then get forced induction, you will run into problems with your computer shifting at WOT. With a stick, if you're making crazy power, and you put steeper gears in, you're gonna have that much more trouble getting off the line, cause you'll sit there spinning like crazy. But you're right, if you're on a budget, the gears are a great mod.

The Deuce · 09-04-2002, 04:01 PM

Quote:

Originally posted by Mustang92
I went from 20 MPG to 19MPG in the city and 27.5 MPG to 27 MPG on the freeway with 4.10's. It's not nearly that much of a difference.

Bill

You got a light foot there bill. I'm only getting 17 or so and I'm running 2:73s. But I'm pretty heavy on the gas just about all the time.

91LX2Bfast · 09-04-2002, 06:26 PM

I actually got better mileage in my 91 LX 5.0 5spd when I changed from 2:73's to 3:73's. Thats because I never really did any highway driving, and the gears let me get into 5th when driving around at 40-45mph. Where as before 5th gear was only good for 60+, a speed I was hardly ever at.
But for an auto, I don't think you should lose anymore then 1-2mpg around town, but definately a lot more if you do highway driving.

09-03-2002, 10:40 PM	#1
Toppchef Registered Member Join Date: Apr 2002 Location: Bethesda MD Posts: 17	4.10's & Gas Mileage For all you 4.10 guys out there: I'm wondering what kind of gas mileage you all are getting? My car is basically stock (flows & FIPK), so I would like to get an idea for a mostly stock automatic 2000 GT. One more question: why are 4.10's better for an automatic than a stick?

09-04-2002, 02:50 AM	#2
StoplightWarrior Registered Member Join Date: Jun 2000 Location: Nor-Cal Posts: 1,311	You will lose 4-5mpg with 4.10s. Sitting in the fast lane on the freeway you will be cruising at 2900-3100. You will love the around town getup, but when you hit it from a roll on the freeway, you wont have much to work with. If I could do it over, I wouldnt put the gears in my GT....Instead, I'd save for a blower. Please, if you can afford it, heed my warning! __________________ Black 2000 GT Auto V2-SQ, Full Steeda G-trac Suspension, Baer Brakes, Saleen Body Kit, Corbeau CR1s, Chrome Cobra R's, etc, etc... 341rwhp, 338 torque 1994 Cobra #4343 Bolt on's only... Cofounder of Raccoon Racing

09-04-2002, 06:40 AM	#3
Titan Registered Member Join Date: Jul 2002 Location: Atlanta Posts: 296	You would go blower before gears?? Hmmm...I dunno. You're the expert, but I would recommend for lower budgets to get the gears. Stoplight, don't you still need gears even after the blower? __________________ Current Sophomore -- Mechanical Engineering Black on Black 98' GT 5-Speed Mods = Stuff

09-04-2002, 10:07 AM	#4
Mustang92 Drag Racer! Join Date: Nov 1999 Location: Lake Worth, FL USA Posts: 757	I went from 20 MPG to 19MPG in the city and 27.5 MPG to 27 MPG on the freeway with 4.10's. It's not nearly that much of a difference. Bill __________________ 2000 GT VRS O/R X, Dynomax Bullets, Steeda Pulleys, Pro-M 80MM, 4.30s, UPR Pro Series Suspension, UPR Tubular K-member, MAC Longtubes, Bullitt Intake, TKO, VT Engine Stage 1 NA Cams, SCT Tune. 285 RWHP/296 RWTQ 11.97 @ 113.20 M/M 100, 7085 www.uprproducts.com www.ponyexpressperformance.com www.modulardepot.com

09-04-2002, 06:26 PM	#7
91LX2Bfast Registered Member Join Date: Dec 1999 Location: Warrington, PA Posts: 694	I actually got better mileage in my 91 LX 5.0 5spd when I changed from 2:73's to 3:73's. Thats because I never really did any highway driving, and the gears let me get into 5th when driving around at 40-45mph. Where as before 5th gear was only good for 60+, a speed I was hardly ever at. But for an auto, I don't think you should lose anymore then 1-2mpg around town, but definately a lot more if you do highway driving. __________________ '97 T-bird LX 4.6L 2V, auto SVO heads/intake, Vortech T-trim, front mounted intercooler, blower cams, Cobra crank, Manley H-beam rods, JE pistons, Aeromotive fuel system w/ 42# injectors, and much more No times yet

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
4.10s! A scientific study...sort of	xxxBlakexxx	Modular Madness	5	04-09-2004 06:28 PM
Speedo gear for 4.10s Anyone??	Chipdog	Windsor Power	2	04-29-2001 08:32 PM
Should I swap in 4.10's for my 3.73's- please read	Killercanary	Windsor Power	15	03-27-2001 10:57 PM
4.10's on the street...	STEEDA85GT	Windsor Power	11	03-09-2001 05:58 AM
3.55's or 4.10's?	93GTDIN	Windsor Power	17	02-23-2001 09:08 PM