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  '64 1/2 to '73 -- The Classic Mustang
  31 spline or 28 spline ????

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Author Topic:   31 spline or 28 spline ????
MASTIFF
Journeyman

Posts: 97
From: maumee, Ohio 43537
Registered: May 2001

posted 06-03-2001 11:00 PM     Click Here to See the Profile for MASTIFF   Click Here to Email MASTIFF     Edit/Delete Message   Reply w/Quote
I have a 72 Mach 1 Mustang with a ford 9" rear end and I wanted to know if there was an easy way to tell if it was a 31 spline or 28 spline axle. The door code is not on the car anymore so I dont know much about the axle. Also the car does not have posi and I am open for suggestions on what gears I should go with. It is a 351C 4V 4speed car and I want it to be a real quick car but I still want to be able to drive it somewhere without tacking it out.

Thanks for any info

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richard bohm
Gearhead

Posts: 373
From: tucson,az-luray,va
Registered: May 2001

posted 06-04-2001 03:04 AM     Click Here to See the Profile for richard bohm   Click Here to Email richard bohm     Edit/Delete Message   Reply w/Quote
for the most part the 31 spline axles are larger than the 28 spline axles. the are exceptions though so the best way is to count the splines.

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steve'66
Gearhead

Posts: 8796
From: Sonoma,CA,USA
Registered: Mar 2000

posted 06-04-2001 01:29 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
As far as gear ratio, try 3.55s. They are a good compromise.
BTW you probably have 28 spline axles, but there's only one way to be certain.

SteveW

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MASTIFF
Journeyman

Posts: 97
From: maumee, Ohio 43537
Registered: May 2001

posted 06-04-2001 01:59 PM     Click Here to See the Profile for MASTIFF   Click Here to Email MASTIFF     Edit/Delete Message   Reply w/Quote
Thanks Guys for the info.....looks like I need to pull an axle shaft out.

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69maverick
Moderator

Posts: 1440
From: Thomaston,CT.
Registered: Jan 2001

posted 06-04-2001 02:15 PM     Click Here to See the Profile for 69maverick   Click Here to Email 69maverick     Edit/Delete Message   Reply w/Quote
One way to be very sure without counting is to look at the end of the axle near the studs in the center if its solid and not a oval shaped hollow its probably a 31 spline

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SteveLaRiviere
Administrator

Posts: 42859
From: Saco, Maine
Registered: May 99

posted 06-04-2001 08:03 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Look at the axle flange. An oval hole is a 28 spline, two large holes and counter sunk center is a 31 spline.

------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.50 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC {Wife's car...}
All Fords since 1977

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