Gears ?

cwm191 · 01-28-2005, 06:49 AM

Is there a way I can tell if my car doesn't have the stock 3.27 gears on it? I have a 2000 GT that I got about 2 months ago. It seems like my speedo is off some, it reads a higher speed than what I think I'm actually going, and my RPMs don't seem right. At 65mph (which probably more like 60mph or less), I'm around 2k. I was thinking maybe the previous owner changed the gears and never recalibrated the speedo? Can someone explain this for me? Thanks.

Jeremy · 01-28-2005, 12:42 PM

Quote:

Originally Posted by cwm191

Is there a way I can tell if my car doesn't have the stock 3.27 gears on it? I have a 2000 GT that I got about 2 months ago. It seems like my speedo is off some, it reads a higher speed than what I think I'm actually going, and my RPMs don't seem right. At 65mph (which probably more like 60mph or less), I'm around 2k. I was thinking maybe the previous owner changed the gears and never recalibrated the speedo? Can someone explain this for me? Thanks.

I would say you should be about 2k around 65, that seems right to me.

Blue02GT · 01-28-2005, 01:16 PM

Put your car up on jack stands. Get someone to help you if possible.
Place a piece of tape or a mark with a grease pencil on your drive shaft. With the parking brake off and the car in nuetral slowly turn the right rear tire, while turning count the amount of full revolutions the drive shaft makes for one complete tire revolution. This why you put the mark or tape on it, for a reference point. If your gears are stock 3.23's then it should make three full reveolutions and one quarter. If for instance it goes 3 and 3/4 turns then you have 3.73's. Four and a little would be 4.10's etc. By the way this assumes you have stock size tires.

cwm191 · 01-28-2005, 01:33 PM

cool, I'll do that. Thanks.

tedinde · 01-30-2005, 11:47 AM

60 is 1850 on my 3.27's.

*madmatt* · 01-31-2005, 07:05 PM

Yea it sounds like 3.73's to me man. Im at about 2000-2100 with my 3.73's at 60 miles per hour.

w01stang · 01-31-2005, 07:51 PM

lets us know what you fine out.... and if you have gears already installed one less thing you need to do except get it calibrated.

MustangMike · 01-31-2005, 09:25 PM

well nobody has asked this ovious question, are you Auto or Stick..because this could be a whole lotta somethign for a wholle lotta nothing..

-Mike :whip2:

cwm191 · 02-01-2005, 08:11 AM

it's an automatic

MustangMike · 02-01-2005, 01:13 PM

then there ya go..you have ths stock gears what you may be experirencing is the feeling of superiority that mustangs have over the common, car when all those 4 bangers are working hard to maintain or accelerate up to speed, the mustang's hearty v8 does it with a doubt ...no worries chum, you're car is ok. :icon_quee

-Mike :toothy9:

gtnumber2 · 02-03-2005, 06:43 AM

Quote:

Originally Posted by cwm191

Is there a way I can tell if my car doesn't have the stock 3.27 gears on it? I have a 2000 GT that I got about 2 months ago. It seems like my speedo is off some, it reads a higher speed than what I think I'm actually going, and my RPMs don't seem right. At 65mph (which probably more like 60mph or less), I'm around 2k. I was thinking maybe the previous owner changed the gears and never recalibrated the speedo? Can someone explain this for me? Thanks.

i have an 01 auto at 70mph your at 2100 rpms. your fine. get gears and you will be more happy

nanaki · 02-07-2005, 06:29 AM

i'm at 2000rpm at 65 with my 3.73s. i have an 04 GT 5 speed.

Joel's98GT · 02-07-2005, 09:31 AM

Quote:

Originally Posted by Blue02GT

Put your car up on jack stands. Get someone to help you if possible.
Place a piece of tape or a mark with a grease pencil on your drive shaft. With the parking brake off and the car in nuetral slowly turn the right rear tire, while turning count the amount of full revolutions the drive shaft makes for one complete tire revolution. This why you put the mark or tape on it, for a reference point. If your gears are stock 3.23's then it should make three full reveolutions and one quarter. If for instance it goes 3 and 3/4 turns then you have 3.73's. Four and a little would be 4.10's etc. By the way this assumes you have stock size tires.

tires size has no effect on that method of finding the gear ratio, you could have 33" mud tires and a 4.10 gear will still turn the d/s 4.1 times, as long as you t the tire 1 revolution.

tires size does matter if you are using the speedo to determine gear though.

Blue02GT · 02-07-2005, 10:12 AM

I belive that it does make a difference. Tire diameter changes will affect your gearing. If I run a 28" tall slick as opposed to a 26" I will raise my final drive ratio. That is why many people with steep gears run a 26" tall tire n/a then switch to a 28" to run nitrous.

*madmatt* · 02-07-2005, 12:55 PM

Oh ok sorry, didnt know that it was an auto. Now get them out and put in some 4.10s.

Joel's98GT · 02-08-2005, 10:02 AM

Quote:

Originally Posted by Blue02GT

I belive that it does make a difference. Tire diameter changes will affect your gearing. If I run a 28" tall slick as opposed to a 26" I will raise my final drive ratio. That is why many people with steep gears run a 26" tall tire n/a then switch to a 28" to run nitrous.

of course it will effect final drive ratio, because the distance around the outside of the tire i more if the diameter is more. BUT, we arent talking about final drive, we are talking about axle gear ratio.

If you are looking for gear ratio, by comparing tire to driveshaft, it doesn't matter at all, 1 axle rotation = number of D/S rotations = gear ratio.

It doesn't matter if you ave no tire on the axle at all, or a 3' diameter wheel, one 360* rotation of the tire = 1 axle rotation = D/s rotations = gear ratio.

I don't think we dissagree, I just think you just misunderstood what I said.

Blue02GT · 02-08-2005, 02:29 PM

Quote:

Originally Posted by Joel's98GT

of course it will effect final drive ratio, because the distance around the outside of the tire i more if the diameter is more. BUT, we arent talking about final drive, we are talking about axle gear ratio.

If you are looking for gear ratio, by comparing tire to driveshaft, it doesn't matter at all, 1 axle rotation = number of D/S rotations = gear ratio.

It doesn't matter if you ave no tire on the axle at all, or a 3' diameter wheel, one 360* rotation of the tire = 1 axle rotation = D/s rotations = gear ratio.

I don't think we dissagree, I just think you just misunderstood what I said.

I see what you are saying. You are correct it can be done with the tire removed just like you said. Except I'm lazy and would not want to remove the tire. There are a couple of good online calculators to figure you gear also if you have aftermarket tires of a different size.

ModMotorRacer · 02-09-2005, 03:51 AM

There is an ID tag on one of your rear cover bolts, look at it. If its there, chances are your gears are stock. If theres no tag, its been opened up.

Adam

Joel's98GT · 02-09-2005, 09:14 AM

Quote:

Originally Posted by Blue02GT

I see what you are saying. You are correct it can be done with the tire removed just like you said. Except I'm lazy and would not want to remove the tire. There are a couple of good online calculators to figure you gear also if you have aftermarket tires of a different size.

you still miss my point, no matter what size the tire, 1 tire rotation = 1 axle rotation. we are looking for axle ratio.

Quote:

Originally Posted by ModMotorRacer

There is an ID tag on one of your rear cover bolts, look at it. If its there, chances are your gears are stock. If theres no tag, its been opened up.

Adam

tru dat

01-28-2005, 06:49 AM	#1 (permalink)
cwm191 Junior Member Join Date: Jan 2005 Posts: 9	Gears ? Is there a way I can tell if my car doesn't have the stock 3.27 gears on it? I have a 2000 GT that I got about 2 months ago. It seems like my speedo is off some, it reads a higher speed than what I think I'm actually going, and my RPMs don't seem right. At 65mph (which probably more like 60mph or less), I'm around 2k. I was thinking maybe the previous owner changed the gears and never recalibrated the speedo? Can someone explain this for me? Thanks.

01-28-2005, 01:16 PM	#3 (permalink)
Blue02GT Ex Mini Smack King Join Date: Nov 2004 Location: St. Louis Posts: 868	Put your car up on jack stands. Get someone to help you if possible. Place a piece of tape or a mark with a grease pencil on your drive shaft. With the parking brake off and the car in nuetral slowly turn the right rear tire, while turning count the amount of full revolutions the drive shaft makes for one complete tire revolution. This why you put the mark or tape on it, for a reference point. If your gears are stock 3.23's then it should make three full reveolutions and one quarter. If for instance it goes 3 and 3/4 turns then you have 3.73's. Four and a little would be 4.10's etc. By the way this assumes you have stock size tires. __________________ True Blue 2002 GT Premium 4r70W 1/8 8.205@ 84.780 1/4 12.874@ 107.20 Bolt on's n/a NMRA #7703 Dyno'd at Modular Depot 251 hp. 291 Tq. 4.30's, 3500 Stall converter, Steeda upper & Lowers, Tokico drag struts, M & M frame connectors, P & A valve body, C&L plenum, Accufab 75mm TB, Jet Hot Long tubes, Hooker O/R X, Steeda catback,SCT tune,Steeda pullies.

01-31-2005, 07:05 PM	#6 (permalink)
madmatt Traitor...lol Join Date: Sep 2004 Location: Lexington, SC Posts: 7,929	Yea it sounds like 3.73's to me man. Im at about 2000-2100 with my 3.73's at 60 miles per hour. __________________ RPMPlanets

01-31-2005, 07:51 PM	#7 (permalink)
w01stang Senior Member Join Date: Jan 2005 Posts: 291	lets us know what you fine out.... and if you have gears already installed one less thing you need to do except get it calibrated. __________________ Installed: Ford C Springs, Mach1 chin & grille delete, SLP Cat-back, Bilstein shocks, UPR short shifter, Steeda CAI, Steeda Underdrive Pully, SCT tunerII, 5.0 Forged Stoker Kit Future: Upgrade suspension and brakes, new Heads, Kenne Bell SC

01-31-2005, 09:25 PM	#8 (permalink)
MustangMike Member Join Date: Nov 2004 Location: Miami Posts: 87	well nobody has asked this ovious question, are you Auto or Stick..because this could be a whole lotta somethign for a wholle lotta nothing.. -Mike :whip2: __________________ 04 Mustang Gt Nitrous Express Wet Plate kit @150,UPR intake, BBK 75mmT/b, BBK Plenum, BBK Longtubes, VRS X , Magnaflow mufflers, 3.73 gears, SVT Focus fuel pump, Diablosport programmer, UPR Tubular K member w/ Eibach coilovers 14" 150lb springs (Front), Moroso trick drag springs (Rear), UPR Camber plates, stage III Competition clutch, Moser 31 Spline axles, Auburn Differential, subframe connectors. Lakewood shocks/struts and ported heads and stg III cam awaiting install.

01-28-2005, 01:33 PM	#4 (permalink)
cwm191 Junior Member Join Date: Jan 2005 Posts: 9	cool, I'll do that. Thanks.

01-30-2005, 11:47 AM	#5 (permalink)
tedinde Senior Member Join Date: Jan 2005 Location: Bear Delaware Posts: 220	60 is 1850 on my 3.27's.

02-01-2005, 08:11 AM	#9 (permalink)
cwm191 Junior Member Join Date: Jan 2005 Posts: 9	it's an automatic

02-01-2005, 01:13 PM	#10 (permalink)
MustangMike Member Join Date: Nov 2004 Location: Miami Posts: 87	then there ya go..you have ths stock gears what you may be experirencing is the feeling of superiority that mustangs have over the common, car when all those 4 bangers are working hard to maintain or accelerate up to speed, the mustang's hearty v8 does it with a doubt ...no worries chum, you're car is ok. :icon_quee -Mike :toothy9: __________________ 04 Mustang Gt Nitrous Express Wet Plate kit @150,UPR intake, BBK 75mmT/b, BBK Plenum, BBK Longtubes, VRS X , Magnaflow mufflers, 3.73 gears, SVT Focus fuel pump, Diablosport programmer, UPR Tubular K member w/ Eibach coilovers 14" 150lb springs (Front), Moroso trick drag springs (Rear), UPR Camber plates, stage III Competition clutch, Moser 31 Spline axles, Auburn Differential, subframe connectors. Lakewood shocks/struts and ported heads and stg III cam awaiting install.

02-07-2005, 06:29 AM	#12 (permalink)
nanaki VROOM! Join Date: Sep 2004 Location: Northern, VA Posts: 34	i'm at 2000rpm at 65 with my 3.73s. i have an 04 GT 5 speed.

02-07-2005, 10:12 AM	#14 (permalink)
Blue02GT Ex Mini Smack King Join Date: Nov 2004 Location: St. Louis Posts: 868	I belive that it does make a difference. Tire diameter changes will affect your gearing. If I run a 28" tall slick as opposed to a 26" I will raise my final drive ratio. That is why many people with steep gears run a 26" tall tire n/a then switch to a 28" to run nitrous. __________________ True Blue 2002 GT Premium 4r70W 1/8 8.205@ 84.780 1/4 12.874@ 107.20 Bolt on's n/a NMRA #7703 Dyno'd at Modular Depot 251 hp. 291 Tq. 4.30's, 3500 Stall converter, Steeda upper & Lowers, Tokico drag struts, M & M frame connectors, P & A valve body, C&L plenum, Accufab 75mm TB, Jet Hot Long tubes, Hooker O/R X, Steeda catback,SCT tune,Steeda pullies.

02-07-2005, 12:55 PM	#15 (permalink)
madmatt Traitor...lol Join Date: Sep 2004 Location: Lexington, SC Posts: 7,929	Oh ok sorry, didnt know that it was an auto. Now get them out and put in some 4.10s. __________________ RPMPlanets

02-09-2005, 03:51 AM	#18 (permalink)
ModMotorRacer Modular Misfit Join Date: Dec 2004 Location: Iowa Posts: 329	There is an ID tag on one of your rear cover bolts, look at it. If its there, chances are your gears are stock. If theres no tag, its been opened up. Adam __________________ www.modularmisfits.com 98GT NA Auto...12.61@109 NMRA Mod Muscle #10

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