Correct rear axle?

[pbf777]

    I'm working on a '68 GT350, 4-spd. cars' rear-end and the question arises as to whether in fact: did "all" GT350's receive 9-inch axles?  Or, is it as apparently as is with the "J_Code" cars (what I might suggest these Shelby's started as) some came with 8-inch rears (perhaps automatic transmission (and non "GT"?) examples with 3.00:1 & higher ratios)?   

    And then if so, next, were they "all" equipped with the "C4AW-4025-B", aka. non-"N", "N-case with the "Daytona pinion support and "1330" yoke?   

    The tag reads:

    (first line)         "DSO - C8ZX-G"
    (second line)    "3  00 8AD 968"

    I got the 3.00 ratio "open" part; perhaps even the "DSO" Dealer Special Order; the "C8ZX" seems reasonable for the '68 vehicle; coupled with the "-G" identifying the unique specification/application; but . . . . . . .?   

    Scott.

[J_Speegle]

Yes all 68 GT350's were equipped with 9" rearends. They should not be confused with Mustangs which, depending on the options could come with 8" or 9". If the GT package was chosen they received the 9".  Didn't have anything to do, for the Mustang, what the gear ratio was.  If you check Marti reports and build sheets the coding identifies that the 68 GT350's were ordered/specified as GT cars.

[pbf777]

Yes all 68 GT350's were equipped with 9" rearends.

    Thank you for your response! 

    And "all" being 31-spline "N-case" assemblies also? 

    Scott.

[Coralsnake]

Shelby axle codes are different from Mustang axle codes, just like Mr Speegle mentioned

[TLea]

C8ZX G would not be original to a 68 350. KR auto/AC open

[pbf777]

KR auto/AC open

    Thank you.

    That's kinda what I was thinking, but just had to ask. 

    So for clarification,  I'm of the belief that a '68 GT350 would have (probably) originally been equipped with a 28-spline, 9-inch axle, utilizing the "C7AW-E" ("single-rib") case and hence the standard pinion support with the "long" 1310 U-joint yoke? 

    Scott.

[Coralsnake]

Wut?

No.

a 1968 Shelby GT350...

Was a 31 spline, 9 inch with a nodular case, no single rib cases

The id tag you have is from a big block with AC car

https://www.thecoralsnake.com/SUSPENSION.html

All the Shelby axles are listed there

[pbf777]

a 1968 Shelby GT350...

Was a 31 spline, 9 inch with a nodular case,

The id tag you have is from a big block with AC car

    Perfect!   

    Thank you,
    Scott.

[warwick]

GT350 302 4V 31 Spline 9 inch   Was a J code 302 4V Mustang a 31 Spline 9" inch?

[shelbydoug]

GT350 302 4V 31 Spline 9 inch   Was a J code 302 4V Mustang a 31 Spline 9" inch?

Yes.9 inch, 31 spline, Daytona yoke.

[pbf777]

Was a J code 302 4V Mustang a 31 Spline 9" inch?

Yes.9 inch, 31 spline, Daytona yoke.

     Any and all "J-Code" examples, are you sure?   

     Scott.

[WT6066-2600]

Previously owned J Code 68 Metuchen built 4 spd NON GT had a 3.00 8" rear axle with a data plate code "5".

Subject has been on other forums, thought the conclusion was GT J Codes came with 3.25 9" while NON GT came with 3:00 8".

[SIIIRHD88]

Our '68 J Code GT was a 9 inch 28 spline 3.25 limited slip.

[shelbydoug]

Was a J code 302 4V Mustang a 31 Spline 9" inch?

Yes.9 inch, 31 spline, Daytona yoke.

     Any and all "J-Code" examples, are you sure?   

     Scott.

I have not seen "Every '68 GT350". That is standard equipment of the GT Package in 1968 as we know it.

The variation from that is the car that should be questioned as far as legitimacy because IT would be out of line.

At this point, there have been so many Shelby cars that have been brought back from the dead by less knowledgeable people with junk yard parts, it would be disappointing to find an inaccurate restoration, but not necessarily surprising.

[warwick]

I can see Ford utilizing 28 spline 9" axles for GT350's auto and 4 spd - and I would expect Mustang J codes with 28 spline 4 spd 9" and GTs autos maybe but autos non GT using 8".

Didn't all 31 spline traction Lok rears have 4 pinion diffs and 28 spline used 2 pinion diffs? And Daytona pinion support came w/31 spline rear.

Ford was too cheap... whoops frugal/efficient to overbuild and they ruled Shelby in 68.

302 4V was a high volume build.