rear end codes - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- 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
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 01-05-2013, 04:26 PM
Registered User
 
Join Date: Jan 2013
Posts: 7
Wiki Edits: 0

Thanks: 5
Thanked 0 Times in 0 Posts
rear end codes

I have been trying to understand these rear axle codes. I get the pages that state what there are but not what they mean. the chart states this. my codes are

Rear Axle Ratio:
The AXLE code is a number or letter indicating the rear axle ratio and standard or locking type axles.

Conventional lock ratio

6 O 3


What is conventional 6 mean?
What does lock O mean?

I get ratio 3?

any ideas?
Rear Axle Codes
Conventional
Lock
Ratio
2
K
2.75
4
M
3.4
6
O
3
9
R
3.25
7
P
3.55

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-05-2013, 04:31 PM
Registered User
 
Join Date: Jan 2013
Posts: 7
Wiki Edits: 0

Thanks: 5
Thanked 0 Times in 0 Posts
rear axle code

Not sure what happen with all the threads.

Question is what is a conventional 6 rear axle?

and what is a lock "O" rear axle?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-05-2013, 05:36 PM
big gear head's Avatar
High Performance Rear Ends
 
Last photo:
Join Date: Nov 2009
Location: Central City, KY
Posts: 2,088
Wiki Edits: 0

Thanks: 12
Thanked 443 Times in 377 Posts
Don't understand the question.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-05-2013, 06:47 PM
Registered User
 
Join Date: Jan 2013
Posts: 7
Wiki Edits: 0

Thanks: 5
Thanked 0 Times in 0 Posts
On the car door the axle code is 6.

When I go to a site to explain codes 1975 Data Plate Decoder

there are 3 catagories
Conventional
Lock
Ratio

Convention choices are 2, 4, 6, 9, 7
LOck choices are K, M, O ,R, P
Ratio are 2.75, 3.4, 3, 3.25, 3.55

Respectivley

My code is conventional 6 which matches with lock O and ratio 3.

What does conventional 6 mean and what does lock O mean?

I attched the website I used but all of them are the same that I viewed.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-05-2013, 07:09 PM
big gear head's Avatar
High Performance Rear Ends
 
Last photo:
Join Date: Nov 2009
Location: Central City, KY
Posts: 2,088
Wiki Edits: 0

Thanks: 12
Thanked 443 Times in 377 Posts
What car is this?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-05-2013, 07:20 PM
Registered User
 
Join Date: Jan 2013
Posts: 7
Wiki Edits: 0

Thanks: 5
Thanked 0 Times in 0 Posts
it is a 1975 Ford Gran Torino Sport
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-05-2013, 08:24 PM
big gear head's Avatar
High Performance Rear Ends
 
Last photo:
Join Date: Nov 2009
Location: Central City, KY
Posts: 2,088
Wiki Edits: 0

Thanks: 12
Thanked 443 Times in 377 Posts
Look at the tag on the rear end. It will tell you what you have. Ford tags have 2 lines of codes. The bottom line will give you the gear ratio, differential and ring gear size. It will read like this. 3L.25 9 xxx. This is a 3.25 gear with the Traction Lock differential and a 9 inch gear. If there is no L in the gear ratio then it has a standard differential.

My guess is that you have a standard differential with 3.00 gears.
Reply With Quote Quick reply to this message
The Following User Says Thank You to big gear head For This Useful Post:
zjosh27 (01-06-2013)
  #8 (permalink)  
Old 01-06-2013, 12:39 AM
SSedan64's Avatar
Registered User
 
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
I think "BGH" is correct. Open Diff w/3.00 gear.
Ford Diff codes, Tag Info >> Ford Rear Axle Assembly Identification - Page 01 - FORDification.com
Reply With Quote Quick reply to this message
The Following User Says Thank You to SSedan64 For This Useful Post:
zjosh27 (01-06-2013)
  #9 (permalink)  
Old 01-06-2013, 03:43 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Conventional = open type differential
Lock = limited slip diff
(you cannot have both, so in your case, "6" = conventional or open diff, aka 'peg leg' because usually only one rear tire spins at a time)
Ratio "3" = 3.00:1 final drive ratio

IIRC you should have a 9" but if you're not sure, you can check the ID info here.

Often the rear gear in the fvehicle no longer matches the data plate. Use Gear ratio check if you want to verify what ratio you have.
Reply With Quote Quick reply to this message
The Following User Says Thank You to cobalt327 For This Useful Post:
zjosh27 (01-06-2013)
  #10 (permalink)  
Old 01-06-2013, 04:15 PM
Registered User
 
Join Date: Jan 2013
Posts: 7
Wiki Edits: 0

Thanks: 5
Thanked 0 Times in 0 Posts
Thank you guys for replying. You were very helpful.

I was interested in understanding what the code were more than the accual rear end.

But I did what the 9inch.

So I have a conventional 6 ( still not sure what the six is for)

What is the difference between a conventional 2, 4, 6, 9 or 7

But it make since the Axle would be and Open Diff with 3.0 rear.


Any thought s on what the K, M, R or P refers to for the lock
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 01-06-2013, 04:43 PM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 57
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 90 Times in 85 Posts
Quote:
Originally Posted by zjosh27 View Post
Thank you guys for replying. You were very helpful.

I was interested in understanding what the code were more than the accual rear end.

But I did what the 9inch.

So I have a conventional 6 ( still not sure what the six is for)

What is the difference between a conventional 2, 4, 6, 9 or 7

But it make since the Axle would be and Open Diff with 3.0 rear.


Any thought s on what the K, M, R or P refers to for the lock
You just have to understand how to read the chart ... (see attachment)

2 and K are both in the first row of that chart, and both are 2.75:1 Ratio.
"2" is conventional (non-locking) and "K" is locking.

The "6" indicated on your certification label puts you in the 3rd row of the chart ... and "6" tells you that it's a conventional diff.
Reading across to the 3rd column ... the ratio is 3 (3.00:1)

Makes sense now?
Attached Files
File Type: pdf Ratio Codes.pdf (124.6 KB, 26 views)

Last edited by 66GMC; 01-06-2013 at 05:03 PM. Reason: Added Chart
Reply With Quote Quick reply to this message
The Following User Says Thank You to 66GMC For This Useful Post:
zjosh27 (01-06-2013)
  #12 (permalink)  
Old 01-06-2013, 04:53 PM
Registered User
 
Join Date: Jan 2013
Posts: 7
Wiki Edits: 0

Thanks: 5
Thanked 0 Times in 0 Posts
Yes it does. Thank you! I am not a mechanic but I do like to understand what people are talking about.

Did you see my other thread about the right axle for my project?
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 01-06-2013, 05:31 PM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 57
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 90 Times in 85 Posts
Quote:
Originally Posted by zjosh27 View Post
Yes it does. Thank you! I am not a mechanic but I do like to understand what people are talking about.

Did you see my other thread about the right axle for my project?
I found it and replied to it as well.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 01-06-2013, 10:20 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by zjosh27 View Post
So I have a conventional 6 ( still not sure what the six is for)

What is the difference between a conventional 2, 4, 6, 9 or 7

But it make since the Axle would be and Open Diff with 3.0 rear.


Any thought s on what the K, M, R or P refers to for the lock
These numbers and letters can be looked at as arbitrarily assigned, or they might denote something in particular to the factory.

My thoughts are, these different numbers/letters (that mean the same thing like 2, 4, 6, etc. and K, M, R, etc.) are used for reasons that only the factory knows for sure.

But for our use, they mean what the chart explains, and beyond that you'll have to use other clues like bearing diameters, axle spline counts, and et cetera to define an axle further.

BTW, nice ride. You can turn that Torino into a fire-breather if you want, plus even looks/drives good stock.
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

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:
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.




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
10 bolt GM rear end codes? 303oldskool Transmission - Rearend 11 10-04-2012 05:57 AM
Trans & Rear end RPO Codes jamesnorris Transmission - Rearend 4 04-24-2009 08:00 PM
Ford 9" rear end vs stock 89 chevy truck rear end jimmy p Transmission - Rearend 2 12-07-2005 03:28 AM
s10 rear end rpo codes S10lady36 Transmission - Rearend 2 10-14-2003 08:20 AM


All times are GMT -6. The time now is 04:01 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.