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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech

going with 373s...how to get speedo working right!!

  • Thread starter Thread starter 96darkhorse
  • Start date Start date Jan 1, 2004
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96darkhorse

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Oct 2, 2001
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wilmington, california
Jan 1, 2004
#1
  • Jan 1, 2004
  • #1
whats everything i need to get my speedo reading correctly after 373s installed..thanks
 

cb18201

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Oct 25, 2003
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CT
Jan 1, 2004
#2
  • Jan 1, 2004
  • #2
you needa new speedo gear, not worth putting in in my opinion, it can be a bitch, your speedo wont be off by much, i have 373s an its off by a few mph
 

Killer95Stang

New Member
Aug 7, 2003
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Covina, CA
Jan 1, 2004
#3
  • Jan 1, 2004
  • #3
well.. to get it closest you can, you will need a 23 tooth speedo gear. Only some performance shops sell it, or you can buy it from a Chrysler dealer... From my understanding it came out of a Jeep CJ-7 with a T-5. Although, the gear wears down over time, and may fail after a while, since the mesh of the oversized gear isn't perfect. The one in my car lasted over 5 years....
 
B

baseman

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Nov 26, 2003
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Providence, RI
Jan 1, 2004
#4
  • Jan 1, 2004
  • #4
96darkhorse said:
whats everything i need to get my speedo reading correctly after 373s installed..thanks
Click to expand...

Instead of a gear, you could look into a SpeedCal ... http://www.dallasmustang.com/?p=9910
 
P

Palehorse95

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Jan 1, 2004
#5
  • Jan 1, 2004
  • #5
cb18201 said:
you needa new speedo gear, not worth putting in in my opinion, it can be a bitch, your speedo wont be off by much, i have 373s an its off by a few mph
Click to expand...

How big of a percentage would you think the difference switching has made?
for example if your speedo says 70mph how fast are ya REALLY going?

I'm also considering this mod.
 

Killer95Stang

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Jan 1, 2004
#6
  • Jan 1, 2004
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With the 23 tooth gear, its like 2-3 mph off... not a big deal for a 5 minutes work, and $15. The speedcal is $70.00 (with shipping), and takes a little longer to install...
 

BlueOvalStangGT

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Oct 27, 2003
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Jan 1, 2004
#7
  • Jan 1, 2004
  • #7
is there any way to get it exact by switching the gear thats in the tranny? not sure what its called
 

Rootus

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Feb 8, 2003
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Portland, Oregon
Jan 1, 2004
#8
  • Jan 1, 2004
  • #8
BlueOvalStangGT said:
is there any way to get it exact by switching the gear thats in the tranny? not sure what its called
Click to expand...
Ideally you should switch both the drive gear (in tranny) and driven gear (outside tranny). But you still won't be exact. I got mine close, and then I set the speedo to read accurately at 60 mph.

Speedcal is probably the best option, but it's also the most expensive.

Dave
 

Killer95Stang

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Jan 1, 2004
#9
  • Jan 1, 2004
  • #9
The perfect (for perfect mph) driver/driven gear ratio with 3.73's and 25.7" tire would be 0.342... With the stock 8 tooth internal gear, and 23 external gear you get a ratio of 0.348.. The closest ratio while switching internal gears to a 7 or 6 tooth would net you a 0.350 ratio, which means the 23 tooth is the best and closest... Just run the 23tooth and check it every few years for wear...
 

Joes95GT

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Jan 23, 2003
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Delaware
Jan 1, 2004
#10
  • Jan 1, 2004
  • #10
There are a lot of inaccuracies here...

Changing the speedo gear takes 30 seconds, why is it a waste of time ? And to get the speedo to read correctly, you need to change the trans gear, which costs 5 and some change from Ford. Using a GPS as a guide, my speedo is about 1 MPH off, after 50 MPH. I wouldn't drive around with the speedometer being off because it racks up unnecessary miles.

Joe
 

95kobrah

Founding Member
Dec 5, 2001
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Ohio
Jan 1, 2004
#11
  • Jan 1, 2004
  • #11
baseman said:
Instead of a gear, you could look into a SpeedCal ... http://www.dallasmustang.com/?p=9910
Click to expand...

Do you have a speed cal? I was just looking at the website and it says 94-2000 one place and then says for 96-2000 in another, just wondering if it was compatible with our computer, i mean if u have one then it obviously is, but like those power-programmers that superchips and hypertech sell, they don't work on our 94-95's. Thanks for the info
 
B

baseman

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Nov 26, 2003
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Providence, RI
Jan 1, 2004
#12
  • Jan 1, 2004
  • #12
95kobrah said:
Do you have a speed cal? I was just looking at the website and it says 94-2000 one place and then says for 96-2000 in another, just wondering if it was compatible with our computer, i mean if u have one then it obviously is, but like those power-programmers that superchips and hypertech sell, they don't work on our 94-95's. Thanks for the info
Click to expand...

Actually, I'm planning on going with 3.73's for my 95 GT AODE, and this seems to be the most viable option for me. I've heard really good things about this device as far as getting within 1-2% accuracy.
 

95kobrah

Founding Member
Dec 5, 2001
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Ohio
Jan 1, 2004
#13
  • Jan 1, 2004
  • #13
baseman said:
Actually, I'm planning on going with 3.73's for my 95 GT AODE, and this seems to be the most viable option for me. I've heard really good things about this device as far as getting within 1-2% accuracy.
Click to expand...

I just got 3.73's for christmas and ill be installing them in march, i have a 5spd, and if this speed cal works for the 94-95 mustangs, ill probably get it. anyone have it that can vouch for its worth? From the website:

SPEED-CAL,94-2003,5-SPD,94-98 AUTOMATICS

Fits Model Years: 1996 thru 2000

so i wonder which it is???
 
P

Palehorse95

New Member
Jan 1, 2004
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TN
Jan 2, 2004
#14
  • Jan 2, 2004
  • #14
96darkhorse said:
whats everything i need to get my speedo reading correctly after 373s installed..thanks
Click to expand...


http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=46104&item=2451737638
 

Black Stampede

Founding Member
Sep 3, 2002
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Grand Rapids, MI
Jan 2, 2004
#15
  • Jan 2, 2004
  • #15
I have the dallas mustangs speedcal and have nothing but good things to say about it. It is dead on and works great.
 

VIPERn94Five-0

Founding Member
Apr 28, 2002
3,352
2
58
Poughkeepsie, NY
Jan 2, 2004
#16
  • Jan 2, 2004
  • #16
Black Stampede said:
I have the dallas mustangs speedcal and have nothing but good things to say about it. It is dead on and works great.
Click to expand...
does the speedcal adjust the odometer as well???



Anthony
 

Mrgreen94gt

SIMMA DA NA!!!
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Jul 16, 2002
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West TN
Jan 2, 2004
#17
  • Jan 2, 2004
  • #17
VIPERn94Five-0 said:
does the speedcal adjust the odometer as well???



Anthony
Click to expand...

As far as I can tell, it does. Since it is adjusting the signal that goes to the gauge cluster.
 

DirtyD916

Active Member
May 25, 2003
804
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38
Norcal 916
Jan 2, 2004
#18
  • Jan 2, 2004
  • #18
you can recaliberate your chip to the currect speedo i think.
 
T

TheUser

Active Member
Jul 25, 2003
1,859
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36
Springfield, MO
Jan 4, 2004
#19
  • Jan 4, 2004
  • #19
DirtyD916 said:
you can recaliberate your chip to the currect speedo i think.
Click to expand...
On the 4.6's, I think that's possible, but I don't think the speedo has anything to do w/ the computer in the 5.0's, which is why you have to replace the gears. I could be wrong, however.
 

Rootus

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Feb 8, 2003
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Portland, Oregon
Jan 4, 2004
#20
  • Jan 4, 2004
  • #20
TheUser said:
On the 4.6's, I think that's possible, but I don't think the speedo has anything to do w/ the computer in the 5.0's, which is why you have to replace the gears. I could be wrong, however.
Click to expand...
You are correct, the EEC does not control the speedo on a 94/95. It is, however, an electronic speedo, so you can use a speedcal on it.

Dave
 
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