Why two part numbers for FP Axles?

[TooSoonJunior]

Noticed in the past few weeks multiple vendors now list two part numbers for the ford axles, descriptions SEEM similar but one includes model year 2017 and the other doesn't.

M-4130-MA: listed for 2015-2017
M-4130-M: listed for 2015-2016

Similarly there are individual axles listed with the same M versus MA designation.

This just a part number revision to include 2017 model year but they are the same? I order the MA pair for my 2015 without noticing the choices at first, hopefully ordered the right ones.

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[Gurjit]

heard the ford racing half shafts have different diameter like on the corvettes to aid in anti-hop or vibration or something

 

[TooSoonJunior]

There's two part numbers for the pair, as well as individually. There's two left side, two right side, and two different pairs of axles to purchase even tho they list the same years.

 

[hmperf]

There are two versions, one of them being phased out. The new version has a different billet joint that will fit both the GT and the Shelby's where the old part number only fit the GT.

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