68 "J" code owners! HELP! - Vintage Mustang Forums
Vintage Mustang Forum
HomeForumGalleryClassifiedsAbout UsAdvertiseContact Us
» Auto Insurance
» Featured Product
Go Back   Vintage Mustang Forums > General Discussion > Concours Forum
Vintage-Mustang.com is the premier Ford Mustang Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools
Old 01-17-2009, 12:44 PM   #1 (permalink)
Senior Member
 
Join Date: Sep 2005
Location: Pawnee, Il 62558
Posts: 813
Default 68 "J" code owners! HELP!

There has been so much confusion about 68 "J" code Mustangs having both 8 and 9 inch rear ends. This is a plea to owners of those cars to check the data plate on your door and note the axle code and reporting if your car is a GT or a "regular 'J' code" Mustang. The current theory is that "regular "J" code cars, with either automatic or standard transmission, are equipped with a 3:00 8 inch axle. We also suspect that if your "J" code 68 options included the GT package you will have a 3:25 ratio axle which is of the nine inch variety. A small sample of Marti reports posted on the California Special website supports this line of thinking and the hope is that many more 68 "J" code owners who frequent this forum will respond. This oddity of Ford production has been discussed just about forever with little resolution. Your help will certainly be apreciated in helping to take the mystery out of the 8 vs 9 inch axle that appear in the 68 "J" code cars.
__________________
murf
jjmurphy is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 01-17-2009, 02:58 PM   #2 (permalink)
Senior Member
 
hallsresto.com's Avatar
 
Join Date: Dec 2006
Location: spartanburg south carolina
Posts: 443
Default

68 Gt350 we have is a 3:89 9 inch..and the 68 J-code GT we recently sold had a 3:50 9 inch...so id say that supports the theory of Gt equipment getting the 9inch...
hallsresto.com is offline   Reply With Quote Quick reply to this message
Old 01-17-2009, 05:49 PM   #3 (permalink)
Senior Member
 
Join Date: Jan 2003
Location: Calif
Posts: 6,789
Default Re: 68 "J" code owners! HELP!

John my Cal Spec J code with the GT package is as expected - 9" 3.25

Of the cars I have in my picture data base I found none of the 50 plus cars that did not match the expected pattern that I had data for

Not sure if there is a "Mystery" or some acceptance issues. Think its just one of those things that we have been looking at for 40 years that no one really focused on.
__________________
Jeff Speegle
Come see us @ ConcoursMustang.com
MCA Shelby Judge, SAAC & Team Shelby Judge (in no particular order
Jeff_Speegle is offline   Reply With Quote Quick reply to this message
Old 01-17-2009, 06:30 PM   #4 (permalink)
Senior Member
 
Join Date: Jan 2004
Location: andover ma
Posts: 2,831
Default Re: 68 "J" code owners! HELP!

My understanding was it depended on the ratio not the equipment package. 3:25 and lower used 9, 3:00 and higher used 8. I don't know whether you could get 3:25 or lower as a stand alone or you had to get GT package to get it.
__________________
[color:blue]MCA Gold card judge 67-68 Shelby
Certified judge 65-70 Shelby, 67-68 Mustang[/color]
tlea is offline   Reply With Quote Quick reply to this message
Old 01-17-2009, 06:51 PM   #5 (permalink)
Senior Member
 
Join Date: Jan 2003
Location: Calif
Posts: 6,789
Default Re: 68 "J" code owners! HELP!

Quote:
Originally Posted by tlea
My understanding was it depended on the ratio not the equipment package. 3:25 and lower used 9, 3:00 and higher used 8. I don't know whether you could get 3:25 or lower as a stand alone or you had to get GT package to get it.

Think I recall pulling 3.55's out of a 68 with a 8"
__________________
Jeff Speegle
Come see us @ ConcoursMustang.com
MCA Shelby Judge, SAAC & Team Shelby Judge (in no particular order
Jeff_Speegle is offline   Reply With Quote Quick reply to this message
Old 01-18-2009, 10:18 PM   #6 (permalink)
Supporting Member
Senior Member
 
Join Date: Mar 2001
Location: Grayson, GA (Atlanta)
Posts: 4,257
Default Re: 68 "J" code owners! HELP!

My 68 GT J Code has a 9" rear with 3.25 gears and a transmission code of 1 and rear axle code of 7. My understanding is that ony the GT's got the 9" rear.
Dave
__________________

68 GT Vert - J Code (1st car I ever drove in '73, dad bought it in '71)
67 C Code Vert Sports Sprint (1st car I ever bought in '75)
06 Vista Blue with Pony Package (1st Mustang I ever bought new)
MCA #49294 Grayson, GA (Atlanta)
daves67ss is offline   Reply With Quote Quick reply to this message
Old 01-19-2009, 02:36 PM   #7 (permalink)
Member
 
Join Date: Feb 2007
Location: Indy
Posts: 45
Default Re: 68 "J" code owners! HELP!

My 68 GT J code had 3.25's and it was a 9". Car was a factory 4 speed.
Eds68 is offline   Reply With Quote Quick reply to this message
Old 01-19-2009, 11:11 PM   #8 (permalink)
Member
 
Join Date: Aug 2003
Location: Edmonds, WA
Posts: 39
Default Re: 68 "J" code owners! HELP!

My early, San Jose, 68 J code fastback,non gt, has a 3.00 8inch open. Interesting.
gofish is offline   Reply With Quote Quick reply to this message
Old 01-20-2009, 08:37 AM   #9 (permalink)
Junior Member
 
mrykl68's Avatar
 
Join Date: Jan 2008
Location: Charlotte, NC
Posts: 5
Default

My 68 J code hardtop, Metuchen built (23B), export car has the standard rear axle ratio - 3.00 8inch - locking type.
__________________

1968 J-Code Coupe


mrykl68 is offline   Reply With Quote Quick reply to this message
Old 01-20-2009, 09:45 PM   #10 (permalink)
FAS
Senior Member
 
Join Date: Jul 2005
Location: Long Island,NY
Posts: 503
Default Re: 68 "J" code owners! HELP!

My 68 gt convert J code NJ car has 9" 3.25 And is believed to original to the car
__________________
http://i28.photobucket.com/albums/c2...3stangcopy.jpg
'67 A-Code GTA Fastback Loaded-'68 J-Code GT Convertible Auto-'69 M-Code Mach 1 Stick
FAS is offline   Reply With Quote Quick reply to this message
Old 01-21-2009, 08:58 PM   #11 (permalink)
Senior Member
 
Krelboyne's Avatar
 
Join Date: Oct 2008
Location: Oregon
Posts: 135
Default Re: 68 "J" code owners! HELP!

Found a mention in the Ford MPC.

Part # C3AZ-4730-B which is the rubber bumper for the 9 inch axle snubbers.

Application lists 302GT in the list with 390, and 428CJ.

The 8 inch carriers relied on a rubber bumper that mounted to the underside of the body directly above the axle center.
__________________
1968 Mustang GT/CS 302-4V
1968 Cougar XR7 302-4V 5-speed conversion
1969 XR7 428SCJ 4 speed 1 of 53 Drag Pack XR-7's.
Krelboyne is offline   Reply With Quote Quick reply to this message
Old 07-30-2010, 12:32 PM   #12 (permalink)
Senior Member
 
rumble's Avatar
 
Join Date: Mar 2004
Location: Ontario, Canada
Posts: 716
Default

Odd how this is something that no one "knows" after all these years! I have a nine inch rear and my car is a Marti-verified GT J-code with 3.25 axle ratio.
rumble is offline   Reply With Quote Quick reply to this message
Old 07-30-2010, 01:10 PM   #13 (permalink)
Junior Member
 
Join Date: Sep 2008
Location: UK
Posts: 3
Default

My 68fb is a Dearborn built "J-code" (non-GT) with an 8" 3.00:1 ratio, open diff.
__________________
1968 'Imperial Blue' Fastback, 302 4v w/C4 + a few goodies (Yeah sorry, I'm a limey!)
1966 Coupe, 5.0 HO (carb'ed) w/C4... in 1,000,000,000 pieces!
cookie is offline   Reply With Quote Quick reply to this message
Old 07-30-2010, 01:52 PM   #14 (permalink)
Senior Member
 
wilit's Avatar
 
Join Date: Apr 2009
Posts: 932
Default

J-code non-GT with an 8" 3.00:1 open here too.
wilit is offline   Reply With Quote Quick reply to this message
Old 07-30-2010, 02:10 PM   #15 (permalink)
Senior Member
 
MagMustangs's Avatar
 
Join Date: May 2010
Posts: 729
Default

To be perfectly honest, I feel that Transmission Option should be included in these posts. To correctly verify if it was a difference between Non-GT and GT, we will want to make sure that the GT cars posted were Both Auto and 4-speed Cars. I know of Two 1968 Shelby GT-350 with Auto and 9" and I had a J-Code Non-GT Coupe with Auto and 9" before, but not sure if it was the Orig. Rear, as it had 4.11 Gears
MagMustangs is offline   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 Vintage Mustang Forums 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:

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

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 Off


Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 11:14 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.