how long are stock axels on a 1969 mustang with 9 inch rear

Discussion in 'Classic Mustangs' started by jerry S, Aug 4, 2006.

  1. jerry S New Member

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    how long are stock axels on a 1969 mustang with 9 inch rear?

    I am upgrading my stock 28 spline axels to 31 splined axels and a Detroit Locker. This is for a 1969 Mach 1 that came with a 351W, FMX tranny, and a 9 inch rear.

    I see at Summit that direct fit replacement rear axels for a 1969 Ford 9 inch come in either 27.125 inches or 31.250 inches. How do I determine which length to order? Both say that they fit my application.

    http://store.summitracing.com/egnsearch.asp?N=700+4294925134+4294851288+4294908331+4294908282+115+4294925082
    jerry S, Aug 4, 2006
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  2. danny clemens Member

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    According to my Ford Parts Interchange Manual the 69 axles used before build date 3/15/69 the axles were 31 1/8" for right and 27 1/16" for left. The axles used after build date 3/15/69 were 30 1/8" for right and 27 1/16 for left. I would say that you need one of each.
    danny clemens, Aug 4, 2006
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  3. dennis112 Active Member

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    Yep, one of each is required.
    dennis112, Aug 4, 2006
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  4. DK832 New Member

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    I had the same issue, but not knowing if I had the original 9" or not there was just 1 way to be sure...
    DK832, Aug 7, 2006
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