You would need the computer and wiring harness from the 99 to make it run.
The fuel delivery system also would have to be up-graded.
Thank you, that's what I thought but didn't want to find out otherwise when trying to get the motor in
Looking for a Used Sierra 2500 in your area?
CarGurus has 163 nationwide Sierra 2500 listings starting at $5,900.
Search GMC Sierra 2500 Questions
GMC Sierra 2500 Experts
Related Models For Sale
Used Cars For Sale