TH350 speedo gear calculation - Hot Rod Forum : Hotrodders Bulletin Board -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 04-28-2007, 10:16 AM
dawg's Avatar
Last photo:
Join Date: Aug 2004
Location: Colebrook Connecticut
Age: 58
Posts: 952
Wiki Edits: 0

Thanks: 0
Thanked 19 Times in 13 Posts
TH350 speedo gear calculation

if you math wizards can check my math for correct speedo gearing
27.1 inch diameter tire
tire revs per mile 768.0
3:73 rear ratio
speedometer calibrated at 1000 revs per mile.
I come up with a 7 tooth drive gear (on tranny shaft)
20 tooth driven gear (on speedo cable)
that will give a .50% margin of error.
Id rather the speedo read a bit high than low.

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 04-30-2007, 10:34 PM
Last photo:
Join Date: May 2003
Location: Shreveport LA
Age: 67
Posts: 5,106
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
8 driving 22 will get you closer.
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
TH350 drive gear replacement dawg Transmission - Rearend 8 04-28-2007 09:07 AM
no 1st gear in my th350 blueday Transmission - Rearend 2 04-26-2007 06:48 PM
th350, no 1st gear!! judis951 Transmission - Rearend 19 03-17-2007 08:41 PM
THM speedo gear seal mhamilton Transmission - Rearend 4 02-19-2006 10:36 AM
th350, no third gear ummduh Transmission - Rearend 2 04-03-2003 03:44 PM

All times are GMT -6. The time now is 08:42 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.