This is what I posted over at IMBOC.com, I'll just copy it over.
Everybody seems to think that Motive makes Ford's gears. This WAS true about a year ago. If you're buying gears, and the part number ends with an N, such as M-4209-F373
N, then you're fine. I just got the answer from FRPP directly. He [Mike from FRPP] said Motive stopped making their gears about a year ago. He also said that the ONLY gear that was made by Motive that had the problem were the 3.55s. All other gears were fine, but Ford started making their own gears once again anyway. I hope this clears up a lot of confusion between Ford, Motive, and who makes what. So make sure you see that N at the end of the part before buying them if you REALLY want original Ford! Besides, the N also means it's made with a new process.
Quote:
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Originally Posted by http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=5701
New manufacturing technology utilizing a Face Hob Process which features a single pass pinion tooth machining operation compared to a conventional three pass process for machining. CNC cut and lapped gear teeth. Higher strength and better quality gears are produced with the Face Hob Process. NOTE: These new gears look a little different, the gear teeth are cut on a different angle and the ring gear has a bevel on the back of the gear.
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