So, now I held off long enough.... I've done hundreds of ribs but never on a Traeger yet, and NEVER EVER as low as 180°, that would be an almost impossible temp on ANY smoker I've ever owned, even my Ugly Drum Smoker. So, for the most part, the 3-2-1 method was NOT invented with the Traeger in mind at all... these are Ribs that cook at 225° at the LOWEST for 3 hours, 2 in foil, and Usually when they come out of foil they are DONE, mine ONLY go back on the grill to harden the BBQ sauce if I want to, sometimes I don't care.
3-2-1 has been around WAY BEFORE any Traeger was a 'home' item and most wood/coal smokers can't even maintain a temp as low as 180°, I NEVER tried to, and I've never made a bad batch of ribs ever...
Ribs are FAIL PROOF, if they are UNDER DONE then cook more, either wrapped or not. If they are OVER DONE and dry, put them in a sealed turkey roaster, add thinned out BBQ sauce (just like pork steaks) and cook them for another hour or 2, they will COME BACK TO LIFE!!!!
►If they already are FALL OFF and you don't like them FALL OFF the bone, THEN make PULLED RIB MEAT!!!! You'll LOVE IT. Get rid of the bones, chop the meat up, add BBQ sauce, and make a Sandwich just like PULLED PORK!!!!
We have a local BBQ restaurant that sells JUST THAT!! PULLED RIB sandwiches!!