Compression Ignition Addict
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The Super Duty nomenclature was introduced in 1998 for the 1999 year model. I think when it states F350 and the Super Duty separately, they are referring to the older model years for the F350.
That said, the second Blue Oval table (below the long "master list") shows a list of codes for the 2004 Super Duty .... and it does state that the code 41 is a 3.73.
The next table below that shows the 2007 axle code of 41 is a 4:10.
So it looks like Ford changed that designation after 2004.
My 2006 WorkShop Manual specifically states that 41 is a 4:10 rear end.
Edit - just looked in my 2004 WSM and it states that a code 41 is a 3.73 rear end. So it changed in 05 apparently.
So your 04 F350, w/ code 41, will be a 3.73 (non limited slip) ratio as you stated. Interesting change. Thanks for being persistent with me - I learned something new.
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Last edited by bismic; 11-04-2019 at 05:23 PM.