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

speedo gear question

  • Thread starter Thread starter bill302
  • Start date Start date Nov 14, 2005

bill302

Active Member
Nov 2, 2005
2,131
1
46
alabama,gadsden
Nov 14, 2005
#1
  • Nov 14, 2005
  • #1
i just got my 3.73's in and need to know what speedo gear to get, i already ordered a 23 tooth, but i got to looking at the ad and it lists the same one to work with 3.73's and 4.10's. anyone know for sure how many teeth i need?
 

CManT1914

New Member
Feb 5, 2004
3,172
2
0
Killeen, Texas
Nov 14, 2005
#2
  • Nov 14, 2005
  • #2
Actually, there is no gear for 3.73's and up. 3.73's, 3.90's, 4.10's etc. use the same one as 3.55's. It's as close as you'll get. That's why it says they're the same gear.
 

bill302

Active Member
Nov 2, 2005
2,131
1
46
alabama,gadsden
Nov 14, 2005
#3
  • Nov 14, 2005
  • #3
ok, that makes sense then. since its made for a 3.55, how much will it be off with a 3.73? shouldn't be too much should it?
 

CManT1914

New Member
Feb 5, 2004
3,172
2
0
Killeen, Texas
Nov 14, 2005
#4
  • Nov 14, 2005
  • #4
Nope, I think it's like 3mph at 70. But if you have taller tires than stock, it will even itself out. With my 315's out back, it's dead on at 70, radar verified.
 
9

90bronconate

New Member
Apr 24, 2005
124
0
0
Phoenix, AZ
Nov 15, 2005
#5
  • Nov 15, 2005
  • #5
well, there is a 5.05% difference. so with stock hight tires, you will be going 5% slower than your speedometer reads. 70 mph times 1.0507=73.55 mph. so there you go. a slightly taller tire will even that little bit out anyways.
 

mytight95

Active Member
Apr 11, 2003
2,605
0
46
Dothan,Al
Nov 15, 2005
#6
  • Nov 15, 2005
  • #6
you can change the gear on the tailshaft, and the driven gear and get it dead nuts.......



that is what i did.

4.10's 6 tooth drive gear(black) 19 gear driven gear(fact.)


jason


jason
 
You must log in or register to reply here.

Similar threads

K
3.8 T5 & Bellhousing to 1987 Lincoln 5.0
  • ks65stang
  • Mar 2, 2026
  • Other Auto Tech
Replies
3
Views
247
Other Auto Tech Mar 3, 2026
Noobz347
Drivetrain Speedo gear ate itself
  • keel
  • Aug 15, 2024
  • Fox 5.0 Mustang Tech
Replies
7
Views
700
Fox 5.0 Mustang Tech Aug 15, 2024
AeroCoupe
T
Newbie looking for some info on speedo gears
  • TDM389
  • Nov 15, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
3
Views
218
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Nov 16, 2025
TDM389
T
K
Drivetrain '87 5.0 Installing New Ring Gear and Pinion - Pattern Questions
  • karhoot
  • Apr 23, 2026
  • Fox 5.0 Mustang Tech
Replies
10
Views
311
Fox 5.0 Mustang Tech May 9, 2026
Mindseye007
P
2000 GT Random Power Loss
  • Pinellas50
  • Mar 9, 2026
  • SN95 4.6L Mustang Tech
Replies
4
Views
240
SN95 4.6L Mustang Tech Mar 23, 2026
Pinellas50
P
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?