SAAC Forum

The Cars => 1967 Shelby GT350/500 => Topic started by: bomb6391 on June 25, 2020, 12:20:16 PM

Title: 9" Rear Specifications
Post by: bomb6391 on June 25, 2020, 12:20:16 PM
A few questions in reference to the rear/center/axles on the GT500: 

-Did the GT500 have only 2 ratio options based on if it was a manual or auto? 
-Should the manual only have a 3.50 ratio and was this open or a trac lok on all of them?   
-Lastly, anything physically specific on the exterior of 31 spline axles that would make them unique to this car? 

Thanks in advance!
Mike
Title: Re: 9" Rear Specifications
Post by: JD on June 25, 2020, 12:40:45 PM
Quote from: bomb6391 on June 25, 2020, 12:20:16 PM
A few questions in reference to the rear/center/axles on the GT500: 

-Did the GT500 have only 2 ratio options based on if it was a manual or auto?  YES


-Should the manual only have a 3.50 ratio and was this open or a trac lok on all of them? 4-Speed 3.50:1 and Auto 3.25:1 ALL Open

-Lastly, anything physically specific on the exterior of 31 spline axles that would make them unique to this car?  others will know better

Thanks in advance!
Mike

Title: Re: 9" Rear Specifications
Post by: bomb6391 on June 25, 2020, 12:48:16 PM
JD- thanks as always!

Mike
Title: Re: 9" Rear Specifications
Post by: gt350hr on June 25, 2020, 07:14:10 PM
   The axles usually had a C7OW forging number on the end of the axles. Often very difficult to read.
     Randy
Title: Re: 9" Rear Specifications
Post by: bomb6391 on June 25, 2020, 10:45:03 PM
Quote from: gt350hr on June 25, 2020, 07:14:10 PM
   The axles usually had a C7OW forging number on the end of the axles. Often very difficult to read.
     Randy

Great.  Thanks.

Mike
Title: Re: 9" Rear Specifications
Post by: The Going Thing on June 25, 2020, 11:28:07 PM
 My 31 spline are C7OW and the ends of the hub are solid where the 28 spline has a sunken cavity on the end.
Title: Re: 9" Rear Specifications
Post by: Bob Gaines on June 25, 2020, 11:45:47 PM
Quote from: JD on June 25, 2020, 12:40:45 PM
Quote from: bomb6391 on June 25, 2020, 12:20:16 PM
A few questions in reference to the rear/center/axles on the GT500: 

-Did the GT500 have only 2 ratio options based on if it was a manual or auto?  YES


-Should the manual only have a 3.50 ratio and was this open or a trac lok on all of them? 4-Speed 3.50:1 and Auto 3.25:1 ALL Open

-Lastly, anything physically specific on the exterior of 31 spline axles that would make them unique to this car?  others will know better

Thanks in advance!
Mike
Easy to forget but the BB auto A/C cars I believe had 3.00:1.
Title: Re: 9" Rear Specifications
Post by: gt350hr on June 26, 2020, 10:38:25 AM
   
+1 3.00 open with A/C and auto.
Title: Re: 9" Rear Specifications
Post by: JD on June 26, 2020, 10:58:53 AM
OK, thanks guys ;-)
Title: Re: 9" Rear Specifications
Post by: brandosaac on June 03, 2021, 03:30:59 PM
post is a little old, but thought id add....

the 67 shelby 31 spline axles are unique to the 67 shelby and the 427 fairlane.
They do have the 3 machined holes that people are used to seeing to identify 31 spline,

But the 67 shelby 31 spline axles (and 427 fairlane) had cast in hash marks at every quarter of the circle , and the perimeter  also an inset  recessed area that is easy to identify. They can be difficult to find and can be expensive.

see attached.

If youre looking for a set, send me a PM