FRPP part numbers for gears that end in "M" are rebranded motive gears. FRPP Gear part numbers that end in "A" are FORD OEM gears. Since Ford offers 4.11 gears in some of their product lines, the will use their Gears, although to help supply, also offer 4.10 gears by Motive. You want to buy the "A" gears and not the "M" gears.
+1 on that! I have the M-4209-G410A. No noise. Rock solid. There is a M-4209-G410M that I have heard noise complaints about.
I had several sets of Motives in my Jeep for rock crawling. I never had performance issues, but they were loud...
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=7376
Read the tech notes for full listing...
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here are the "A" gears which are Ford OEM
http://www.lmperformance.com/3223/50.html
Here are the "M" gears which are Motive
http://www.speedconcepts.net/product_info.php?products_id=197
Then....
The FRPP "M"'s are reboxed motive, the "A"'s are NOT motives
Oh really? Wouldn't have known.
Just messing with you Terry....