4.10 Gear Question...with a twist...

ruven_aa · October 25th, 2011, 12:23 AM

So, after reading everywhere, I have finally decided to get me some 4.10 gears for my 98 GT. I decided it is not really gonna be that much change for fuel economy and since the car is not a daily driver anymore, I am cool with that. But while doing research at americanmuscle.com I read this:

"For drag applications, a 4.10 is the way to go. If you install a 4.10 on a vehicle that is used for a lot of highway driving, you will find that you are unable to reach highway speeds (65 and higher) because of the gearing, and you will also notice a lot more fuel consumption than normal."

What the heck? It can't reach 65mph or higher? That sounds so wrong, it doesn't make any sense, and I don't really want to believe it, but I do drive a lot on the highway at speeds averaging 84mph. So, I want to make sure before I buy. What do you people make of the above statement? BS? Anyone with 4.10 gears?

ruven_aa · October 25th, 2011, 12:30 AM

Also probably important to mention is that I have 18" wheels int he back with 275/45 tires

LoveStangs88 · October 25th, 2011, 02:08 AM

Load of BS, plenty of guys on here have 4.10 gears and do 75 on the highway, only at 75 youll be around 3k rpms vs stock being around 2.3k rpms. Id have to

if that was true cuz thats insane to have a top speed of 65 with 4.10s lol.

I dunno what tranny you have but most people prefer 3.73's for manuals and 4.10's or 4.30's for automatic drag apps.

brharris777 · October 25th, 2011, 02:19 AM

i have 4.10s, trust me, youll go faster than 65 lol. Im not proud of it (well i kind of am) but i know first hand that a 98 cobra with 4.10s will go faster than the speedometers highest number (its 160). But Lovestang is right, it will run around 3 k at highway speed and I dont care what ANYONE says, 4.10s WILL noticeably affect your fuel mileage. But they are quite fun.

1989Gt. · October 25th, 2011, 04:22 AM

Stock gears at 70mph im at 2000 rpms maybe less just remember at highway speeds your gonna put alot of strain on the motor at 3k rpms.

JoshC! · October 25th, 2011, 06:51 AM

i drive my car every day on the freeway at 75mph, my 4.10s do just fine.

OptionalStang · October 25th, 2011, 07:37 AM

ya, thats whine makes me nervous..plus my buddy had next to no gains with his 4:10's..but he put them in an auto..i wanna do 3;73's becuase i drive ALOT of highway and i like to cruise at around 80ish..when i take my overdrive off its about what id be with with gears rpm wise..i just wouldnt want to run my engine at them rpm's that long..

JoshC! · October 25th, 2011, 08:59 AM

Originally Posted by brharris777

i have 4.10s, trust me, youll go faster than 65 lol. Im not proud of it (well i kind of am) but i know first hand that a 98 cobra with 4.10s will go faster than the speedometers highest number (its 160). But Lovestang is right, it will run around 3 k at highway speed and I dont care what ANYONE says, 4.10s WILL noticeably affect your fuel mileage. But they are quite fun.

i still get over 20mpg

brharris777 · October 25th, 2011, 07:41 PM

Originally Posted by JoshC

i still get over 20mpg

IMRC's being open at 3k wrecks my MPGs. Also, 4v, different tune, more air, more fuel.

chiefsmustang20 · October 25th, 2011, 07:53 PM

I love my 4.10s ....I want 4.30s now lol

Sent from my Autoguide iPhone app

JoshC! · October 25th, 2011, 09:16 PM

Originally Posted by brharris777

IMRC's being open at 3k wrecks my MPGs. Also, 4v, different tune, more air, more fuel.

4V's are more efficient, so you should actually be getting a little better than a 2V.

ruven_aa · October 25th, 2011, 09:23 PM

Thank you everyone, I am much more comfortable now lol I am definitely getting those 4.10s.

I'll let you guys know when I do. I wanna become more active in the forum. I also did a PI intake swap with NPI heads that I wanna post about.

LoveStangs88 · October 25th, 2011, 09:44 PM

Well everyone on here is gonna get different gas mileage for there gear setup due to the airflow they have with their intake/exhaust parts, also spark plugs, fuel filters and tire inflation can affect it. I know after i put on new spark plugs, off road x pipe, a 75mm TB/plenum and CAI my gas mileage got wayyyy better than when i first had the car. Like 50-75+ more miles to a full tank due to the better air flow and better spark from the plugs and new wires, my old plugs were so old the gap was around .80 lol

But to the OP let us know how u like the 4.10s im also in the process of getting my PI intake on my NPI heads.

brharris777 · October 26th, 2011, 06:57 PM

Originally Posted by JoshC

4V's are more efficient, so you should actually be getting a little better than a 2V.

volumetric efficiency does not translate into fuel efficiency. but like lovestang said, everyones is gonna be different.

1989Gt. · October 26th, 2011, 07:15 PM

Originally Posted by brharris777

volumetric efficiency does not translate into fuel efficiency. but like lovestang said, everyones is gonna be different.

All volumetric efficiency is the engines ability to breathe.

ruven_aa · October 27th, 2011, 11:46 PM

Yeah, I'll keep you guys updated on my mod. Do you think a Bama tune would take care of the speedometer problem the 4.10s will cause?

1989Gt. · October 28th, 2011, 04:38 AM

no youll need a new speedo gear

Mana_MGT · October 28th, 2011, 06:22 AM

SCT x3 solved my speedo issue...

Everett · October 28th, 2011, 06:23 AM

A mod motor is built to and is suprizingly efficient at 3000 rpms. Don't worry about the revs. Your motor will have a larger torque multiple so it will take less power to get to speed and maintain it. As long as your not reving the shit out of it cold and always let the oil get to temp kod motors will last forever. Even at high rpms. I have a pi intake and romeo heads if your interested. A 70 hp bump would turn that pony into a stallion

Tang Stang · October 28th, 2011, 09:11 AM

Originally Posted by Mana_MGT

SCT x3 solved my speedo issue...

That's because you have a '03. The OP has a '98. He'll need a speedo gear or speedcal to correct his speedo.

October 25th, 2011, 12:23 AM	#1
ruven_aa Newbie 1998 Mustang GT 14.15@105.5 Join Date: Oct 2010 Location: Tucson, AZ Posts: 39 iTrader: 0 reviews	4.10 Gear Question...with a twist... So, after reading everywhere, I have finally decided to get me some 4.10 gears for my 98 GT. I decided it is not really gonna be that much change for fuel economy and since the car is not a daily driver anymore, I am cool with that. But while doing research at americanmuscle.com I read this: "For drag applications, a 4.10 is the way to go. If you install a 4.10 on a vehicle that is used for a lot of highway driving, you will find that you are unable to reach highway speeds (65 and higher) because of the gearing, and you will also notice a lot more fuel consumption than normal." What the heck? It can't reach 65mph or higher? That sounds so wrong, it doesn't make any sense, and I don't really want to believe it, but I do drive a lot on the highway at speeds averaging 84mph. So, I want to make sure before I buy. What do you people make of the above statement? BS? Anyone with 4.10 gears?

October 25th, 2011, 02:08 AM	#3
LoveStangs88 Regular 96 Mustang GT B There 1 Day. Join Date: Jun 2010 Location: Aurora, CO Posts: 460 iTrader: 0 reviews	Load of BS, plenty of guys on here have 4.10 gears and do 75 on the highway, only at 75 youll be around 3k rpms vs stock being around 2.3k rpms. Id have to if that was true cuz thats insane to have a top speed of 65 with 4.10s lol. I dunno what tranny you have but most people prefer 3.73's for manuals and 4.10's or 4.30's for automatic drag apps. __________________ PI Manifold. FRPP. Steeda. Magnaflow. BBK. Accufab. RAM. MGW. MSD. NGK. NTK. Billet. J&M. Powerslot. Hawk. Walbro. Motul. Fel-Pro. Dupli-color.

October 25th, 2011, 02:19 AM	#4
brharris777 Hardcore Enthusiast 1998 Mustang Cobra Join Date: Apr 2008 Location: Bismarck ND Posts: 1,919 iTrader: 0 reviews	i have 4.10s, trust me, youll go faster than 65 lol. Im not proud of it (well i kind of am) but i know first hand that a 98 cobra with 4.10s will go faster than the speedometers highest number (its 160). But Lovestang is right, it will run around 3 k at highway speed and I dont care what ANYONE says, 4.10s WILL noticeably affect your fuel mileage. But they are quite fun. __________________ " When in doubt, go flat out"- Colin McRae MM Cobra Club #76 MM Cleavage Club #14 285 CREW #8

October 25th, 2011, 06:51 AM	#6
JoshC! I Hate Convertibles... 2000 GT Vert Join Date: Oct 2007 Location: Odessa, Texas Posts: 5,511 iTrader: 0 reviews	i drive my car every day on the freeway at 75mph, my 4.10s do just fine. __________________ Im topless, are you? Topless Mustang Club Founder Black Stang Crew Member #boobs out mods/pics

October 25th, 2011, 07:53 PM	#10
chiefsmustang20 Enthusiast '02 VERT 13.08@106.11 Join Date: Sep 2007 Location: TEXAS Posts: 646 iTrader: 0 reviews	I love my 4.10s ....I want 4.30s now lol Sent from my Autoguide iPhone app __________________ CMS STAGE II FRPP 4.10s LTS, O/R H, FLOWMASTER WELD ONS EDELBROCK INTAKE MHS 6061 ELBOW NX PLATE 100 SHOT SCT X3 TUNED BY JOE MANSFIELD AT ABOVE AND BEYOND PERFORMANCE

October 25th, 2011, 12:30 AM	#2
ruven_aa Newbie 1998 Mustang GT 14.15@105.5 Join Date: Oct 2010 Location: Tucson, AZ Posts: 39 iTrader: 0 reviews	Also probably important to mention is that I have 18" wheels int he back with 275/45 tires

October 25th, 2011, 04:22 AM	#5
1989Gt. Hardcore Enthusiast 1989 Mustang GT Join Date: Apr 2008 Posts: 2,799 iTrader: 0 reviews	Stock gears at 70mph im at 2000 rpms maybe less just remember at highway speeds your gonna put alot of strain on the motor at 3k rpms.

October 25th, 2011, 07:37 AM	#7
OptionalStang Banned 1997 cougar 4.6 1/2PI TooFast4theFUZZ Join Date: May 2011 Location: se wi Posts: 991 iTrader: 1 reviews	ya, thats whine makes me nervous..plus my buddy had next to no gains with his 4:10's..but he put them in an auto..i wanna do 3;73's becuase i drive ALOT of highway and i like to cruise at around 80ish..when i take my overdrive off its about what id be with with gears rpm wise..i just wouldnt want to run my engine at them rpm's that long..

October 25th, 2011, 09:23 PM	#12
ruven_aa Newbie 1998 Mustang GT 14.15@105.5 Join Date: Oct 2010 Location: Tucson, AZ Posts: 39 iTrader: 0 reviews	Thank you everyone, I am much more comfortable now lol I am definitely getting those 4.10s. I'll let you guys know when I do. I wanna become more active in the forum. I also did a PI intake swap with NPI heads that I wanna post about.

October 25th, 2011, 09:44 PM	#13
LoveStangs88 Regular 96 Mustang GT B There 1 Day. Join Date: Jun 2010 Location: Aurora, CO Posts: 460 iTrader: 0 reviews	Well everyone on here is gonna get different gas mileage for there gear setup due to the airflow they have with their intake/exhaust parts, also spark plugs, fuel filters and tire inflation can affect it. I know after i put on new spark plugs, off road x pipe, a 75mm TB/plenum and CAI my gas mileage got wayyyy better than when i first had the car. Like 50-75+ more miles to a full tank due to the better air flow and better spark from the plugs and new wires, my old plugs were so old the gap was around .80 lol But to the OP let us know how u like the 4.10s im also in the process of getting my PI intake on my NPI heads. __________________ PI Manifold. FRPP. Steeda. Magnaflow. BBK. Accufab. RAM. MGW. MSD. NGK. NTK. Billet. J&M. Powerslot. Hawk. Walbro. Motul. Fel-Pro. Dupli-color.

October 27th, 2011, 11:46 PM	#16
ruven_aa Newbie 1998 Mustang GT 14.15@105.5 Join Date: Oct 2010 Location: Tucson, AZ Posts: 39 iTrader: 0 reviews	Yeah, I'll keep you guys updated on my mod. Do you think a Bama tune would take care of the speedometer problem the 4.10s will cause?

October 28th, 2011, 04:38 AM	#17
1989Gt. Hardcore Enthusiast 1989 Mustang GT Join Date: Apr 2008 Posts: 2,799 iTrader: 0 reviews	no youll need a new speedo gear

October 28th, 2011, 06:22 AM	#18
Mana_MGT Hardcore Enthusiast 2003 Mustang GT 15.8@ 100-ish Mph Join Date: Jun 2010 Location: Dubai - UAE Posts: 1,376 iTrader: 0 reviews	SCT x3 solved my speedo issue... __________________ Dark Shadow Gray 1 mod or 2 Thanks to Sarah for the Sig!! http://www.moddedmustangs.com/forums...-member-35708/ MM DSG Crew Member#3

October 28th, 2011, 06:23 AM	#19
Everett Hardcore Enthusiast 2000 gt Join Date: Oct 2010 Location: Saskatoon Posts: 1,053 Blog Entries: 1 iTrader: 2 reviews	A mod motor is built to and is suprizingly efficient at 3000 rpms. Don't worry about the revs. Your motor will have a larger torque multiple so it will take less power to get to speed and maintain it. As long as your not reving the shit out of it cold and always let the oil get to temp kod motors will last forever. Even at high rpms. I have a pi intake and romeo heads if your interested. A 70 hp bump would turn that pony into a stallion __________________ Black and White Crew Crew Member # 3 centerforce dual friction,.100 shot freeflow exhaust,70mm accufab tb,professional products plenum, tri ax,3.90s amazing how fast you can go when the road never curves .....lighting up the Canadian prairie

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