Ring Gear Number Question - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 05-03-2017, 08:28 AM Thread Starter
 
Join Date: Sep 2014
Location: Carlisle, Pa
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ring Gear Number Question

Went to change the rear in my 70 GTO to 3:73 and found these numbers on the present ring gear: 3A42 GM LC 251
Can anyone tell me what these numbers signify? (I bought the rear some time ago as a Pontiac 3:08 12 bolt rear.) I'll count the teeth and figure out the present ratio. But I've not seen these numbers before. Hoping to be able to use the same carrier. Thanks for your help.
Jjkra is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 05-03-2017, 11:01 AM
 
Join Date: Jan 2015
Location: Injun Territory, 'Merica!
Posts: 1,611
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 121 Post(s)
The 12 bolt gear set is most likely a GM service (parts) gear set from much later. I've ran into similar inscribed numbers on NOS 3.31 12 bolt gear sets which I've set-up.

On your 12 bolt, am assuming the '70 is a factory 455 car, I'm keep track of original housing stamped dates & codes. If the lower right hand webbing of the center housing does not have an alphanumeric date code, would be interested in what your axle tube is stamped. Thanks!
Pinion head is offline  
post #3 of 3 (permalink) Old 05-12-2017, 03:46 PM Thread Starter
 
Join Date: Sep 2014
Location: Carlisle, Pa
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks, but this is not an original 455-car. The 400 was gone when I bought it. Rear is not original either. Sorry, wish I could help you further.
Jared
Jjkra 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



Similar Threads
Thread Thread Starter Forum Replies Last Post
Ring and Pinion Gear for GTO alanmay0 1964-1974 Tempest, Lemans & GTO General Discussion 5 09-30-2017 10:34 AM
Is the 67 GTO ring gear a non C clip?? alanmay0 1964-1974 Tempest, Lemans & GTO General Discussion 4 12-03-2016 02:51 PM
'65 GTO Rear gear ring and pinion change. tigervette 1964-1974 Tempest, Lemans & GTO Exhaust, Suspension, Alignment, Fuel Tank and Brakes. 1 04-06-2015 03:12 PM
What is the best ring gear for mpg and performance for a 66 GTO with a 4 speed RSWHITE 1964-1974 Tempest, LeMans & GTO Projects, Barn Finds & Restoration Discussions 7 12-06-2014 01:12 PM

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