I went from a 2018 Sierra 1500 5.3 SLT to a 2021 Sierra 3.0 AT4 two weeks ago. The 2018 had a Warn Ascent replacement front winch bumper w/Warn Evo 10s. I kept the winch when I traded it in, expecting to put it in a replacement bumper for the AT4. I can only find front bumpers for the 3.0 duramax w/o a winch mount.
I can’t even find a simple 2” receiver mount to use w/a cradle.
I don’t know this for sure, but I think the issues are a lack of space due to intercooler location and airflow to intercooler. Getting the diesel was more important than lack of bumper availability for me.
https://www.addictivedesertdesigns.com/2019-gmc-sierra-1500-front-bumpers
