Is my thinking correct? - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 1 (permalink) Old 09-21-2019, 11:00 AM Thread Starter
 
histoy's Avatar
 
Join Date: May 2019
Location: Davenport Iowa
Posts: 56
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Is my thinking correct?

The speedometer on my '66 GTO reads 14% too high. I'm running larger tires plus a previous owner may have switched rear ends, as the car just turned 98,000 miles. My car had a 3.08 rear end from the factory. When I'm doing 35 mph in town it reads 40 and when I'm doing 65 mph on the highway it reads 74. This indicates to me that I need to increase the number of teeth on the speedometer gear by 14% to get it to read correctly. For example only ... 35 teeth currently X 114% = 40 teeth on the new gear. Does this make sense to you? I'm going to verify the number of teeth currently on the gear, when I change the engine oil this fall and I'll order a new gear at that time.
histoy is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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