Fairly sure my 99 GT came with 4.10s....

KB99GT · March 31st, 2011, 11:08 PM

Previous owner didn't tell me all of the mods his son did in the short amount of time he allowed him to have it... it has a new pinion seal on it and im pulling around 90 at 6k in 3rd....a friend of mine that has been into mustangs since he started driving drove it and said at a minimum it has 3.73s but it feels like 4.10s....thoughts? I can start off in 2nd and at 10mph go WOT and smoke the tires off easy.

wtfcrunch · March 31st, 2011, 11:13 PM

My 3rd tops at about 94-96 but I too don't know what gears are in mine. I assumed stock.

JoshC! · March 31st, 2011, 11:17 PM

i would guess 3.73s cause 4.10s top out at 82ish in 3rd

blkfordsedan · March 31st, 2011, 11:18 PM

Look in the last few pages of threads for one about 4.10's. There's a gear ratio calculator that cliffyk posted. Also a formula that I added earlier, if you prefer to do the math by hand. The first thing to do is make sure your speedo is correct. You can time yourself on a highway cruise at 60MPH by using the mile-marker posts. It should take exactly 1 minute to travel 1 mile at a steady 60MPH cruise. If your speedo is accurate, the calculations will tell you your gear ratio.

Shaun03GT · March 31st, 2011, 11:19 PM

90mph @ 6000 rpm in 3rd gear with stock tire size is 3.73's. With 4.10's that would be like 83mph

KB99GT · March 31st, 2011, 11:26 PM

Speedo is accurate according to my gps, and it isn't chipped. Anyone know why the plenum would have the pony plate on top a golden color? None of the other badges or emblems are like that. It isn't paint. Its almost like its anodized that color.

Shaun, thanks a ton. Nice to know how I was able to pull from a 98 cobra so easily earlier. I was told this awhile back, but it didn't make sense how easily I could pull from him from a 40 roll unless I did indeed have gears.

Shaun03GT · March 31st, 2011, 11:29 PM

Rust?

Maverick530 · March 31st, 2011, 11:35 PM

Originally Posted by KB99GT

Speedo is accurate according to my gps. Anyone know why the plenum would have the pony plate on top a golden color? None of the other badges or emblems are like that. It isn't paint. Its almost like its anodized that color.

OMG you must have the super rare... Mustang PIMP edition

KB99GT · March 31st, 2011, 11:41 PM

Originally Posted by Maverick530

OMG you must have the super rare... Mustang PIMP edition

Heh, im dead serious. Isn't rust. Took some brasso to it and all it did was shine it up. It isn't a rust color. Dunno. Everything else looks like a normal 99-04 plenum. I guess someone got creative along the line before it got to me.

6ER THEN I 8ER! · March 31st, 2011, 11:43 PM

Originally Posted by KB99GT

Speedo is accurate according to my gps, and it isn't chipped. Anyone know why the plenum would have the pony plate on top a golden color? None of the other badges or emblems are like that. It isn't paint. Its almost like its anodized that color.

Shaun, thanks a ton. Nice to know how I was able to pull from a 98 cobra so easily earlier. I was told this awhile back, but it didn't make sense how easily I could pull from him from a 40 roll unless I did indeed have gears.

alot of dealers did things to make their GT's look special...kinda like when you see a v6 or GT with gold badges driving around...

KV007 · March 31st, 2011, 11:43 PM

do the tire spin trick and count the rotations

Perfectcircle · March 31st, 2011, 11:58 PM

Originally Posted by KV007

do the tire spin trick and count the rotations

x2. simple, and fast way to tell for sure.

KB99GT · April 1st, 2011, 12:09 AM

Never done the tire spin trick. Quick explanation?

Btw, perfectcircle, seen em live?

KV007 · April 1st, 2011, 12:12 AM

How To Determine Rear Gear Ratio

KB99GT · April 1st, 2011, 12:35 AM

Originally Posted by KV007

How To Determine Rear Gear Ratio

Thanks, KV. Appreciate it!

G.T. Rags · April 1st, 2011, 12:48 AM

Gear Ratio Calc

sharkbait · April 1st, 2011, 12:57 AM

Originally Posted by KB99GT

Speedo is accurate according to my gps, and it isn't chipped. Anyone know why the plenum would have the pony plate on top a golden color? None of the other badges or emblems are like that. It isn't paint. Its almost like its anodized that color.

Shaun, thanks a ton. Nice to know how I was able to pull from a 98 cobra so easily earlier. I was told this awhile back, but it didn't make sense how easily I could pull from him from a 40 roll unless I did indeed have gears.

the pony means its stock

zipmaster07 · April 1st, 2011, 02:58 AM

Originally Posted by Maverick530

OMG you must have the super rare... Mustang PIMP edition

lol... My pony is also golden. Honestly I thought they all came this way. It's just a stock plenum, but I like Maverick's explanation better. I'll make sure kelly blue book adds the "PIMP edition" to their list of mods.

Couldn't tell you about 3rd gear but I've got 4:10's in mine and it runs about somewhere in the range of 2500RPM's in 5th (manual) @ 70MPH. I'd give you more accurate numbers but I haven't driven it in 3 months (My stang is still being stored for the winter

) and I'm starting to forget.

Tang Stang · April 1st, 2011, 10:33 AM

Originally Posted by KV007

How To Determine Rear Gear Ratio

That link kind of over-complicates things.

Just raise the rear of the car, turn the driveshaft by hand, and count the number of driveshaft revolutions required to turn the tires one full revolution.

3 1/2 turns of the driveshaft = 3.55's
3 3/4 turns of the driveshaft = 3.73's
just over 4 turns = 4.10's

Etc, etc.

KB99GT · April 1st, 2011, 09:24 PM

3.73s. Now I'm wondering how the speedo is correct without a chip or tune..

March 31st, 2011, 11:08 PM	#1
KB99GT Regular 1999 Mustang GT 5spd Join Date: Nov 2010 Location: Georgia Posts: 86 iTrader: 0 reviews	Fairly sure my 99 GT came with 4.10s.... Previous owner didn't tell me all of the mods his son did in the short amount of time he allowed him to have it... it has a new pinion seal on it and im pulling around 90 at 6k in 3rd....a friend of mine that has been into mustangs since he started driving drove it and said at a minimum it has 3.73s but it feels like 4.10s....thoughts? I can start off in 2nd and at 10mph go WOT and smoke the tires off easy.

March 31st, 2011, 11:13 PM	#2
wtfcrunch Hardcore Enthusiast 2003 Mustang GT Prem Conv Join Date: Mar 2011 Location: Gloucester, VA Posts: 1,212 iTrader: 0 reviews	My 3rd tops at about 94-96 but I too don't know what gears are in mine. I assumed stock. __________________ BURN RUBBER NOT YOUR SOUL TylerL idgafMustangClub

March 31st, 2011, 11:17 PM	#3
JoshC! I Hate Convertibles... 2000 GT Vert Join Date: Oct 2007 Location: Odessa, Texas Posts: 5,511 iTrader: 0 reviews	i would guess 3.73s cause 4.10s top out at 82ish in 3rd __________________ Im topless, are you? Topless Mustang Club Founder Black Stang Crew Member #boobs out mods/pics Last edited by JoshC!; March 31st, 2011 at 11:22 PM.

March 31st, 2011, 11:18 PM	#4
blkfordsedan Enthusiast 2004 Mustang GT Join Date: Dec 2010 Location: Nebraska Posts: 684 iTrader: 0 reviews	Look in the last few pages of threads for one about 4.10's. There's a gear ratio calculator that cliffyk posted. Also a formula that I added earlier, if you prefer to do the math by hand. The first thing to do is make sure your speedo is correct. You can time yourself on a highway cruise at 60MPH by using the mile-marker posts. It should take exactly 1 minute to travel 1 mile at a steady 60MPH cruise. If your speedo is accurate, the calculations will tell you your gear ratio. __________________ -Brian 2004 GT TR3650, MAC Straight Shot CAI, FRPP 70mm, TFS plenum, catted X-pipe, Pypes Violator polished 304SS cat-back, custom tuned by AM/Bama...... 4.10's - coming soon!

March 31st, 2011, 11:19 PM	#5
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 7.92 @ 91.13mph 1/4 - 12.21 @ 115.84mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 13,443 iTrader: 12 reviews	90mph @ 6000 rpm in 3rd gear with stock tire size is 3.73's. With 4.10's that would be like 83mph __________________ Vortech V1 Intercooled @ 11psi 394rwhp/392rwtq @ 9.5psi 415rwhp/400rwtq @ 11psi on Methanol Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

March 31st, 2011, 11:26 PM	#6
KB99GT Regular 1999 Mustang GT 5spd Join Date: Nov 2010 Location: Georgia Posts: 86 iTrader: 0 reviews	Speedo is accurate according to my gps, and it isn't chipped. Anyone know why the plenum would have the pony plate on top a golden color? None of the other badges or emblems are like that. It isn't paint. Its almost like its anodized that color. Shaun, thanks a ton. Nice to know how I was able to pull from a 98 cobra so easily earlier. I was told this awhile back, but it didn't make sense how easily I could pull from him from a 40 roll unless I did indeed have gears. Last edited by KB99GT; March 31st, 2011 at 11:36 PM.

March 31st, 2011, 11:29 PM	#7
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 7.92 @ 91.13mph 1/4 - 12.21 @ 115.84mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 13,443 iTrader: 12 reviews	Rust? __________________ Vortech V1 Intercooled @ 11psi 394rwhp/392rwtq @ 9.5psi 415rwhp/400rwtq @ 11psi on Methanol Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

March 31st, 2011, 11:43 PM	#11
KV007 Hardcore Enthusiast 2003 Mustang Gt Slow Join Date: Jul 2009 Location: redding,california Posts: 2,532 Blog Entries: 2 iTrader: 2 reviews	do the tire spin trick and count the rotations __________________ 409rwhp at 4500 rpms.Vortech V1 Intercooled,kurgan motorsports powerpipe, 3.12 pulley, all Mac Exhaust,Sct Tuner,Bolt Ons,Cobra Brakes,MM cc plates,Vis 2000 cobra r hood,MGW shifter,Strange 31 Spline axles,Eaton Possi

April 1st, 2011, 12:09 AM	#13
KB99GT Regular 1999 Mustang GT 5spd Join Date: Nov 2010 Location: Georgia Posts: 86 iTrader: 0 reviews	Never done the tire spin trick. Quick explanation? Btw, perfectcircle, seen em live?

April 1st, 2011, 12:12 AM	#14
KV007 Hardcore Enthusiast 2003 Mustang Gt Slow Join Date: Jul 2009 Location: redding,california Posts: 2,532 Blog Entries: 2 iTrader: 2 reviews	How To Determine Rear Gear Ratio __________________ 409rwhp at 4500 rpms.Vortech V1 Intercooled,kurgan motorsports powerpipe, 3.12 pulley, all Mac Exhaust,Sct Tuner,Bolt Ons,Cobra Brakes,MM cc plates,Vis 2000 cobra r hood,MGW shifter,Strange 31 Spline axles,Eaton Possi

April 1st, 2011, 09:24 PM	#20
KB99GT Regular 1999 Mustang GT 5spd Join Date: Nov 2010 Location: Georgia Posts: 86 iTrader: 0 reviews	3.73s. Now I'm wondering how the speedo is correct without a chip or tune..

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