Need a new Rear end 1968 GTO - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 07-10-2017, 03:33 PM Thread Starter
 
Join Date: Jul 2016
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Need a new Rear end 1968 GTO

Just toasted the rear end in my 1968 GTO. Would like to upgrade to a posi system. Anyone have a tip on what to buy and where? Planning on a 3.55 gear ratio.

Last edited by blackheart; 07-11-2017 at 01:11 PM.
blackheart is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 07-12-2017, 10:04 AM Thread Starter
 
Join Date: Jul 2016
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Auburn 3.55 posi is what I ended up with. No idea where mechanic is getting it.
blackheart is offline  
post #3 of 7 (permalink) Old 07-13-2017, 09:57 AM
 
Join Date: Jul 2016
Location: North Louisiana
Posts: 593
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
bigD is offline  
 
post #4 of 7 (permalink) Old 07-15-2017, 05:58 AM
Super Moderator
 
BearGFR's Avatar
 
Join Date: Aug 2008
Location: Springtown, TX
Posts: 5,742
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 122 Post(s)
Garage
Depending on how much torque/power you're making (and of course the ever-present budget), you might consider solving the problem once and for all by swapping the whole assembly out for a 9". That's what I put under my '69, a Moser 9" with nodular center section, high spline count Moser axles, Wavetrac diff, and 3.50 gears - custom made with all the mounts to bolt right in. It wasn't cheap, but I'll never have to worry about breaking it - ever. I got mine from Spohn Engineering.

Bear

BearGFR
Springtown, TEXAS
BearGFR is offline  
post #5 of 7 (permalink) Old 07-18-2017, 05:04 PM Thread Starter
 
Join Date: Jul 2016
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Auburn 3.55 is in

Didn't want to lose any top end. Runs great and the entire repair including labor was under $2K. Just got her home.
blackheart is offline  
post #6 of 7 (permalink) Old 07-18-2017, 07:54 PM
 
Join Date: Nov 2012
Location: South of Boston
Posts: 185
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 31 Post(s)
[QUOTE=blackheart;805737]Didn't want to lose any top end. Runs great and the entire repair including labor was under $2K. Just got her home.[/QUOTE
Glad to hear it worked out for you. I have a peg leg 2.93 in my 68 Gto that I want to make posi and having a ton of problems finding the fix. I love the gear ratio eith my turbo 400 but tire spin like crazy of the line into 2nd . I kept my rebuild close to stock on motor. Hoping I can find the same fix. Tough to do with 2.93 gears. Doug
dd68gto is offline  
post #7 of 7 (permalink) Old 07-18-2017, 08:59 PM
 
Join Date: Jul 2016
Location: North Louisiana
Posts: 593
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
"...I have a peg leg 2.93 in my 68 Gto that I want to make posi and having a ton of problems finding the fix..."


This Auburn 5420114 posi unit will work with 2.93 gears. Will that solve your problem ?

https://autoplicity.com/1196389-aubu...ngComNOFITMENT

https://www.justdifferentials.com/AG...5420114-hp.htm

https://www.summitracing.com/parts/a...RoC2usQAvD_BwE
bigD 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)
 



Similar Threads
Thread Thread Starter Forum Replies Last Post
68 gto 2.93 rear end rbsmithjr 1964-1974 Tempest, Lemans & GTO Exhaust, Suspension, Alignment, Fuel Tank and Brakes. 6 02-19-2015 12:01 AM
1968 GTO rear end question mrvandermey 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions. 28 10-20-2013 11:02 AM
64 GTO rear end khinton 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions. 2 03-24-2012 10:24 AM
1968 Lemans Rear end gears sknight751 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions. 4 02-22-2009 09:04 AM
67 GTO no rear end GTO_KID 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions. 4 05-10-2008 12:58 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