'03 GM HD drivetrain into 01 HD?

A

Atrus

Forum Member
Asking cause you guys know your shit and a lot of the Gmt800 forums seem to whine about the simplest shit....

Please edumacate me. If I had an 01 2500 crew cab (8.1L/Allison/4wd) and wanted to swap in the drive train from an 03 2500 single cab (8.1L/Allison/4wd), what do I need to know?

I am not hip on the 8.1L/Allisons

I assume 01 is cable throttle and 03 is drive by wire. Will the 01's wiring mate up to the '03 drivetrain? Can I swap tb' s or intakes if needed?

I do have a TechII clone so I can do crank relearn and programming if needed (theoretically anyway - I am a n00b with the TechII)

Reason for swap? '01 has a lotta miles and wear and tear, but '03 is junk body and has 10k original on it 😁
 
Not sure about 8.1, but a friend swapped a 03+ 5.3 into a 99. I wanna say he put the cable throttle body on the 03+ manifold. He did plug a couple ports in the manifold with JB weld, don't remember exactly what they were for though.

I would think the you could just use your current intake manifold and swap the rest, but not entirely sure.
 
Should be able to swap it over and use all the accessories off the 01, just make sure they didn’t change the relic tee wheels or anything that’s internal. If not it should be plug and play.
 
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