Ok this probly a dumb question but...

JonnyB · April 23rd, 2009, 11:15 PM

Putting in gears like 3.73 dosent throw of the odometer right? Im 99.9% sure they dont but just checkin and if you want to why im asking a seamingly stuipid question well the answer is simple. My friend miller light has taken over most rational thoughts in my brain for one and two i saw this on carsoup YELLOW 1987 Ford Mustang GT (Car/Truck) located in the Fargo, ND area.

cowboyup351 · April 23rd, 2009, 11:20 PM

nope. Don't throw it off.

superbean · April 23rd, 2009, 11:25 PM

Actually it does.

If you going from a 3.08 gear (which you prob have) then it will be different.

HMUSN · April 23rd, 2009, 11:26 PM

yes it does.

the odometer reads correctly still, but the gears do not, so it is an invalid reading from the odometer.

Cool Bam · April 23rd, 2009, 11:28 PM

I have 3,73's. I also have low profile tires and my speedometer is off by 5 mph, so thats due to the tires right?

1fst5.0 · April 23rd, 2009, 11:28 PM

it sure does, and the crappy parts is that 23 tooth speedo gear is suppose to be enough for 3.55, 3.73 and 4.10s. sucks huh?

cowboyup351 · April 23rd, 2009, 11:29 PM

Originally Posted by superbean

Actually it does.

If you going from a 3.08 gear (which you prob have) then it will be different.

Whoops,,,,,,,,,,,been a long day. Don't know what I was thinking.

JonnyB · April 23rd, 2009, 11:38 PM

Ya I knew it throws the speedo of as mines of by 10mph but i didnt know it messed with the odometer. Guess I learnd something new today.

grnstang · April 23rd, 2009, 11:56 PM

obviously it messes up the odometer. if the car thinks its going faster than its going to rack up the miles quicker therefore an incorrect odometer reading because of the speedometer reading too fast due to the gears

Cool Bam · April 24th, 2009, 12:05 AM

You could always go someplace that you know is "X" miles away and then do the trip thing.

JonnyB · April 24th, 2009, 12:08 AM

^Good point grnstang. Guess I didnt think of it that way.

Blkknght · April 24th, 2009, 12:29 AM

i always use the "fake" radar detectors that flash if your going to fast on the highway.....try that....stay at a constant speed and compare with your speedo.....

flyin ryan · April 24th, 2009, 01:09 AM

Even if you switch the speedo gear to the correct one you car will still be off by a few mph. To correct that you don't only have to change the speedo gear but the gear located inside your transmission so they both match up with whatever ratio you put into your rear end. I forget the name of the gear im referring to but it's nothing special but since you have to crack the trans open to do so most people shy away from it and just learn to deal with the mph being off

April 23rd, 2009, 11:15 PM	#1
JonnyB Regular Join Date: May 2007 Location: Fargo, ND Posts: 69 iTrader: 0 reviews	Ok this probly a dumb question but... Putting in gears like 3.73 dosent throw of the odometer right? Im 99.9% sure they dont but just checkin and if you want to why im asking a seamingly stuipid question well the answer is simple. My friend miller light has taken over most rational thoughts in my brain for one and two i saw this on carsoup YELLOW 1987 Ford Mustang GT (Car/Truck) located in the Fargo, ND area. __________________ E303cam, hooker long headers, no cats, flomaster mufflers, mac CAI, A/C delete, c4 tranny w/shift kit, 3.73 gears, msd ignition, sub frame connectors

April 23rd, 2009, 11:25 PM	#3
superbean Hardcore Enthusiast 1998 Cobra 13.24@105.66 Join Date: Aug 2008 Location: North Carolina Posts: 1,778 iTrader: 0 reviews	Actually it does. If you going from a 3.08 gear (which you prob have) then it will be different. __________________ weeee foooord!

April 23rd, 2009, 11:26 PM	#4
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	yes it does. the odometer reads correctly still, but the gears do not, so it is an invalid reading from the odometer. __________________

April 23rd, 2009, 11:28 PM	#5
Cool Bam Banned 87 stang + 97 ranger both combined i can't break 15 secs. Join Date: Jan 2009 Location: Somewhere in Cbus OH Posts: 475 iTrader: 0 reviews	I have 3,73's. I also have low profile tires and my speedometer is off by 5 mph, so thats due to the tires right? __________________ [SIZE="3"][B][I][U][COLOR="Lime"]Loooking for a set of 16 x 8 Chrome Cobra R Style Wheels. [/COLOR][/U][/I][/B][/SIZE] Something new in 2009.....You'll have to wait and see..... :o

April 23rd, 2009, 11:38 PM	#8
JonnyB Regular Join Date: May 2007 Location: Fargo, ND Posts: 69 iTrader: 0 reviews	Ya I knew it throws the speedo of as mines of by 10mph but i didnt know it messed with the odometer. Guess I learnd something new today. __________________ E303cam, hooker long headers, no cats, flomaster mufflers, mac CAI, A/C delete, c4 tranny w/shift kit, 3.73 gears, msd ignition, sub frame connectors

April 23rd, 2009, 11:20 PM	#2
cowboyup351 Regular 89 Mustang GT Join Date: Mar 2009 Location: Ft. Worth, TX Posts: 69 iTrader: 0 reviews	nope. Don't throw it off.

April 23rd, 2009, 11:28 PM	#6
1fst5.0 Regular 1986 mustang gt Join Date: Apr 2009 Location: el paso tx Posts: 189 iTrader: 0 reviews	it sure does, and the crappy parts is that 23 tooth speedo gear is suppose to be enough for 3.55, 3.73 and 4.10s. sucks huh?

April 23rd, 2009, 11:56 PM	#9
grnstang Hardcore Enthusiast 91 LX 13.7@101 Join Date: Oct 2008 Location: Norwalk OH Posts: 1,426 iTrader: 1 reviews	obviously it messes up the odometer. if the car thinks its going faster than its going to rack up the miles quicker therefore an incorrect odometer reading because of the speedometer reading too fast due to the gears __________________

April 24th, 2009, 12:05 AM	#10
Cool Bam Banned 87 stang + 97 ranger both combined i can't break 15 secs. Join Date: Jan 2009 Location: Somewhere in Cbus OH Posts: 475 iTrader: 0 reviews	You could always go someplace that you know is "X" miles away and then do the trip thing. __________________ [SIZE="3"][B][I][U][COLOR="Lime"]Loooking for a set of 16 x 8 Chrome Cobra R Style Wheels. [/COLOR][/U][/I][/B][/SIZE] Something new in 2009.....You'll have to wait and see..... :o

April 24th, 2009, 12:08 AM	#11
JonnyB Regular Join Date: May 2007 Location: Fargo, ND Posts: 69 iTrader: 0 reviews	^Good point grnstang. Guess I didnt think of it that way. __________________ E303cam, hooker long headers, no cats, flomaster mufflers, mac CAI, A/C delete, c4 tranny w/shift kit, 3.73 gears, msd ignition, sub frame connectors Last edited by JonnyB; April 24th, 2009 at 12:10 AM.

April 24th, 2009, 12:29 AM	#12
Blkknght Newbie 1990 Mustang GT Join Date: Apr 2009 Posts: 28 iTrader: 0 reviews	i always use the "fake" radar detectors that flash if your going to fast on the highway.....try that....stay at a constant speed and compare with your speedo.....

April 24th, 2009, 01:09 AM	#13
flyin ryan Banned Join Date: Jun 2008 Posts: 3,387 iTrader: 0 reviews	Even if you switch the speedo gear to the correct one you car will still be off by a few mph. To correct that you don't only have to change the speedo gear but the gear located inside your transmission so they both match up with whatever ratio you put into your rear end. I forget the name of the gear im referring to but it's nothing special but since you have to crack the trans open to do so most people shy away from it and just learn to deal with the mph being off

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