Author Topic: Rear axle splines  (Read 341 times)

Offline GTSpecial39

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Rear axle splines
« on: April 07, 2017, 06:54:33 PM »
Just wondering if there is an easier way to find out how many splines my rear axles have without having to tear everything apart. Thanks

GTSpecial39

Offline preaction

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Re: Rear axle splines
« Reply #1 on: April 07, 2017, 07:10:41 PM »
Model, engine, and year info would enable many here to help.
8R02S125064- January 6 1968  SJ   7F93S591808 - April 28 1967  Dearborn   7F91S544039 - December 17 1966 Dearborn

Offline GTSpecial39

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Re: Rear axle splines
« Reply #2 on: April 07, 2017, 07:51:47 PM »
Its a 71 Mach 1, 351C "M" code and sorry about lack of info!

GTSpecial39

Offline carlite65

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Re: Rear axle splines
« Reply #3 on: April 07, 2017, 08:04:52 PM »
you should consider adding the info to your signature.
5F09C331248

Offline J_Speegle

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Re: Rear axle splines
« Reply #4 on: April 07, 2017, 09:54:33 PM »
IF we knew the axle code (from the id tag or the buildsheet) that would make the task easier. Looks something like WES-R

Either way still not enough info to be sure since you could have an optional gear ratio and things like AC can affect the standard gear ratio.

An educated though uncertain guess would be that the axles are 28 spline
« Last Edit: April 07, 2017, 09:58:24 PM by J_Speegle »
Jeff Speegle

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Offline Mike_B_SVT

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Re: Rear axle splines
« Reply #5 on: April 10, 2017, 03:31:25 PM »
Just wondering if there is an easier way to find out how many splines my rear axles have without having to tear everything apart. Thanks

GTSpecial39

Don't tear "everything" apart, just remove one back wheel and look at the center section of the rear axle.  Might even be able to get away with just popping off a center cap.

31 spline will have 3 holes in a row.  28 spline will have a large rectangular-ish indent.

*this is almost always the case, but apparently there are early versions of 28 spline that have 3 holes like the later 31 spline.  However, if your rear axle is original to your car this should not be a possibility.  If I'm wrong, the experts here will correct me ;-)

Mike B.

2003 Mustang Cobra Convertible
1 of 354 in Sonic Blue

1970 Cougar Eliminator (Competition Gold / Black Decor Interior), 428SCJ, Ram-Air, 4-speed w/ Hurst shifter
Built: Dearborn, Oct 6th, 1969
Cat Bites Man!