How to tell gear ratio by counting teeth - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-24-2013, 03:44 PM
Compression Ignition Addict
 

Join Date: Oct 2012
Posts: 170
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
How to tell gear ratio by counting teeth

Doing some differential work i thought it might be nice to know what gear ratio i have since the sticker with the axle code has peeled and blown away. Searched and found a differential co. online that stated, well in my case if i have a count of 41 on the ring gear and 9 on the pinion that i have 4.56 gears. Does this sound right?

On another note they stated ideal backlash on the ring gear when shimming up the carrier is .010 Is this correct?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 04-24-2013, 03:50 PM
Compression Ignition Addict
 

Join Date: Apr 2012
Location: Texas
Posts: 691
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
no tag on the diff with the ratio? it'll be 3.55s or 4.10s.
Reply With Quote Quick reply to this message
  #3  
Old 04-24-2013, 04:14 PM
Compression Ignition Addict
 

Join Date: Oct 2012
Posts: 170
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Ill try and find the site i was on that seemed like it had all the numbers and ways to figure out what gearing you have. 41 ring and 10 pinion are 4.10s and 41-11 are 3.73s. My gears are aftermarket and never asked the PO what ratio. Ill find the site i found this info. on and post back.
Reply With Quote Quick reply to this message
  #4  
Old 04-24-2013, 04:16 PM
Compression Ignition Addict
 

Join Date: Oct 2012
Posts: 170
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
drivetrain.com
Reply With Quote Quick reply to this message
  #5  
Old 04-24-2013, 04:25 PM
Compression Ignition Addict
 

Join Date: Apr 2012
Location: Texas
Posts: 691
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I would be curious to know what gears were installed.
Reply With Quote Quick reply to this message
  #6  
Old 04-24-2013, 04:53 PM
Serving Our Country!
 

Join Date: Aug 2007
Location: Manor, TX
Posts: 2,782
Thanks: 0
Thanked 4 Times in 4 Posts
Feedback Score: 2 reviews
If you still have the gears in the axle, just spin it by hand and count the revolutions between the pinion and ring.
Reply With Quote Quick reply to this message
  #7  
Old 04-24-2013, 05:11 PM
Compression Ignition Addict
 

Join Date: Aug 2008
Location: Madison, WI
Posts: 2,925
Thanks: 2
Thanked 61 Times in 59 Posts
Feedback Score: 0 reviews
Um, just divide the number of ring teeth by the number of pinion teeth....
Reply With Quote Quick reply to this message
  #8  
Old 04-24-2013, 05:15 PM
Compression Ignition Addict
 

Join Date: Apr 2012
Location: Texas
Posts: 691
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Is it really that simple?!?!?
Reply With Quote Quick reply to this message
  #9  
Old 04-24-2013, 05:16 PM
Compression Ignition Addict
 

Join Date: Jan 2011
Location: SoCal
Posts: 449
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
I would be willing to bet you mis-counted the Pinion gear teeth...it's probably got 10 teeth, not nine.....

and yes, it's that simple..... just divide the ring gear tooth count by the pinion gear tooth count....

41 divided by 9 = 4.5555555555

41 divided by 10 = 4.1

etc....
Reply With Quote Quick reply to this message
  #10  
Old 04-24-2013, 05:22 PM
Compression Ignition Addict
 

Join Date: Oct 2012
Posts: 170
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Counted again. Marking 1st tooth with paint. 41 and 9. 4.56 it is. sweeeet.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

Log-in

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.



Thread Tools
Display Modes

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



All times are GMT -8. The time now is 07:07 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors