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Old 02-29-2016, 09:44 AM   #7
Mike C
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Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,740
Re: 14 bolt dually diff ,04 has no front pinion bearing

You've gotten good info from the other guys. The 11.5 Aam axle does not have the bolt on pinion support as you have seen. It is not a FF 14 with the 10.5" ring gear and removeable pinion support.

More info on dually rears: Most square body dually' swerve Dana 70 HD. The cab and chassis trucks usually had the FF 14 as the installed diff. I have both an 86 K30 with the 70HD and an 85 CnC with the FF 14. It's amazing how much wider the 70 is as well.
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