3rd Gen Engine and Drivetrain -> 2003-2007 5.9 liter Engine and drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

AAM 10.5 or 11.5??

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Old Sep 21, 2007 | 08:01 PM
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CTD NUT's Avatar
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From: Caistor Centre, ON, Canada
AAM 10.5 or 11.5??

Need some quick verification from the 3rd gen experts....

Do all 3rd gen 2500 CTD's have the 11.5 AAM rear or did some actually come with the 10.5?
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Old Sep 21, 2007 | 08:45 PM
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Nobody knows??
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Old Sep 21, 2007 | 08:55 PM
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some early non high output 03s had the 10.5
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Old Sep 21, 2007 | 09:24 PM
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if it's a heavy duty... yes, it has the 11.5. The non heavy duty has the 10.5.
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Old Sep 21, 2007 | 09:30 PM
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The '03-04 2500 standard output Cummins with auto had the 10.5.

MikeyB
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Old Sep 22, 2007 | 12:59 AM
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Just the SO's in 03 had the 10.5" rear.

All the rest have the 11.5"
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Old Sep 22, 2007 | 10:11 AM
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Above is true.

'03 2500 SO's have 10.5
'03 3500 SO's have 11.5

HO's have the 11.5
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Old Sep 24, 2007 | 09:54 AM
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MikeyB is correct. '03 Standard Output manual trans trucks had 11.5, only the SO autos had 10.5
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