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**hatzie** · 11-09-2020, 12:22 PM

What's wrong with the 2003?
I assume the 2003 has dual zone climate control. This is not just the control head in the dash. There's a temp sensor in the headliner and an outdoor temp sensor that might or might not be present along with the associated wiring... among other things. GM didn't make it easy to edit the BCM so it's not just a matter of plugging in and flipping a few bits or bytes to recognize the new hardware. I have seen some software for modding BCM contents but I don't have any experience with it.

The forward 1/3 of the 4wd frame has mounts for the front axle and other small differences.
It's not impossible but it's not just a bolt in project.

If you want 4wd parting out the 04 to make the 03 operational might be the easiest way to go about it. Extreme rust will preclude this course of action.

11-09-2020, 12:22 PM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,915	Re: Convert 2500HD to 4wd? What's wrong with the 2003? I assume the 2003 has dual zone climate control. This is not just the control head in the dash. There's a temp sensor in the headliner and an outdoor temp sensor that might or might not be present along with the associated wiring... among other things. GM didn't make it easy to edit the BCM so it's not just a matter of plugging in and flipping a few bits or bytes to recognize the new hardware. I have seen some software for modding BCM contents but I don't have any experience with it. The forward 1/3 of the 4wd frame has mounts for the front axle and other small differences. It's not impossible but it's not just a bolt in project. If you want 4wd parting out the 04 to make the 03 operational might be the easiest way to go about it. Extreme rust will preclude this course of action. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.