Burning smell from engine

I have 2016 4 door trd sport manual 12k miles. Ok I was parking my truck up a driveway in reverse in 4 wheel drive hi on a snowy surface incline. My first attempt, made it up halfway. My second attempt, got more speed and made it up and the driveway was about 10ft. long. Both attempts I let the clutch all the way out and didn't ride it and I'm very good with Manuals. After I parked there was a very bad smell from the engine area, I can't put my finger on the smell exactly. It didn't smell like clutch or brake, weird burning smell. The next day I started the truck and the smell came back when idling but more faint. The smell faded more and more after time, no other problems mechanical just the smell.
Anyone have any similar situations or ideas what the smell came from. I appreciate any feed back, thanks.
 
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