31 spline on FMX....i believe it is C7SZ-4841-A....there was some kind of machining change by ford on this part in 1970 or something, but not made anymore.
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The yoke for FMX is 31 spline!The yolk is a 28 spline and will be much shorter that the original. The yolk you are looking for is commonly used, even today on jeeps. I got my yolk for my 71 Mach I at a pick a part from a 1996 jeep cherokee. Cost was $23. Works great and it beats getting aftermarket for $150-200. There was no need to mess with the drive shaft.
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