Check it don't tighten anything unless there is an issue. I've been fixing cars professionally for 25+ years and I still make mistakes. You gotta go back under the car and double check everything. Grab the yoke and see if it moves. It will be obvious. IF all looks good you might consider having the drive shaft checked by a drive line company.Went by the book on the entire install so it may be a possibility but not likely. It's always made a small bit of noise when doing that down shift before but it's just louder now. May need to tighten down the pinion nut then?
Woot woot glad you found it. Moot point on the numbers if the vibration is gone since we don't have to look any further.Found the culprit it was a broken u joint. Couldn't tell until I took the driveshaft out. But old gears were 2.41 and new ones are 3.73 wheel and tire saize is 255-50-16