Looked it up...1993 was the transition year...
Thanks for raining on my parade anyway, you little bitch !!!
So that takes care of that Roughneck. Just so you know, I prolly wouldn't have taken it anyway, but just so you're in the know and don't scrap or throw any away, the ECM's in 91-93, or 92 and 93, with 6.5 diesels and Auto 4L80-E transmissions are standalone ECM's and wiring harness to operate the 4L80-E transmission and they are highly sought after, and usually bring a little cash.
I do happen to have to have a 2wd 4L80-E but IF I USE IT, and don't sell it, my intent was to run it in a street/mostly strip truck with some low 4.56 or 4.88 gears and still be able to drive it on the freeway. Being a street/strip truck, I wouldn't need the automatic functions and planned on running a neck snapping full manual valve body. I did it before back in the day with a daily driver Th350, so I'm sure I can do it again. It's actually pretty fun with a Ratchet shifter.