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**LEEVON** · 11-15-2016, 07:56 PM

I researched this thoroughly when I had a 2002 2500HD 8.1L 2wd. You won't find anything on the internet except for a couple of solid axle swaps and one guy on a forum who said he did it. I came to the conclusion that if you had a nice complete parts truck that yes it could be done. There was one tab that needed to be welded, most everything else is bolt-up. Your original Alison trans can even be fitted with the correct parts. You will have wiring, PCM, TCM, and programming also. As for everything in between, guess you will have to dive in and find out?

11-15-2016, 07:56 PM	#2
LEEVON Moderator Join Date: Jul 2006 Location: Ozark, MO Posts: 4,920	Re: 2 to 4 Wheel Drive Conversion? I researched this thoroughly when I had a 2002 2500HD 8.1L 2wd. You won't find anything on the internet except for a couple of solid axle swaps and one guy on a forum who said he did it. I came to the conclusion that if you had a nice complete parts truck that yes it could be done. There was one tab that needed to be welded, most everything else is bolt-up. Your original Alison trans can even be fitted with the correct parts. You will have wiring, PCM, TCM, and programming also. As for everything in between, guess you will have to dive in and find out? __________________ '86 GMC C30 Crew ~ '86 C20 Crew ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '74K10 ~ '71 Cheyenne swb ~'50 3100 bagged ~ '80 Wife ~ Late model kids