speedo gear calculation - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 08-07-2019, 02:31 PM Thread Starter
 
deanhickey's Avatar
 
Join Date: Apr 2015
Location: London and Maine
Posts: 149
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 38 Post(s)
Garage
speedo gear calculation

I need some help. I have been trying to find out how many teeth my driven speedo gear should have. These are the numbers:
tire diameter:25.10
Revolutions per mile:803.5
axel ratio:3.36
dive teeth:5
tire size:P235/60R14
Transmission: Turbo 400

My calculation is: 5x3.36x 803.5 divided by 1001 =13.4

the gear holder is a 40 series it has the making on the outside and the gear that was in it was a yellow 41 tooth gear.
(I have a photo of the drive teeth but I get invalid file when I try to up load.)

What am I missing

Thanks,
Dean
deanhickey is offline  
Sponsored Links
Advertisement
 
post #2 of 2 (permalink) Old 08-07-2019, 04:15 PM Thread Starter
 
deanhickey's Avatar
 
Join Date: Apr 2015
Location: London and Maine
Posts: 149
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 38 Post(s)
Garage
Quote:
Originally Posted by deanhickey View Post
I need some help. I have been trying to find out how many teeth my driven speedo gear should have. These are the numbers:
tire diameter:25.10
Revolutions per mile:803.5
axel ratio:3.36
dive teeth:5
tire size:P235/60R14
Transmission: Turbo 400

My calculation is: 5x3.36x 803.5 divided by 1001 =13.4

the gear holder is a 40 series it has the making on the outside and the gear that was in it was a yellow 41 tooth gear.
(I have a photo of the drive teeth but I get invalid file when I try to up load.)

What am I missing

Thanks,
Dean
Correction the Drive gear has 16 teeth. that gives me a driven gear of 43 teeth.
deanhickey is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 2004-2006 GTO > Drive train, suspension, alignment and brakes.

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome