8.1L - '01 to '03 interchangeability

Atrus

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First post on here, but have lurked for a while. I could really use your help for pre-planning

Anyone know of a guide that gives detailed changes on the engine/drivetrain of the 8.1 by year? I know a little on the LD side, but the HD/8.1 is new to me.

I have a 2001 crew cab 8.1L/Allison/4x4 that I am looking to swap a 2003 8.1L/Allison/4x4 drivetrain into. Reason being, the 2003 is a ridiculously low mileage drivetrain but is a beat-up regular cab.

Curious on what changed from '01 to '03...reluctor wheels, sensors/wiring harnesses, fuel delivery, etc.

Thanks in advance!
 

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