Bad transfer case or transmission?

new person here. Be nice.
Drove truck on bad unjoint and carrier bearing for 1000miles,, with heavy heavy vibrations. Now I replaced both, vibrations are all gone, and truck is almost 100%. Now I get a slight jerk or push. This jerk happens when on or under 2.5k RPM at speeds 40-60MPH. Did I fak up my transfer case or transmission? Thanks.

 

Don't see how it could be the transfer case unless it's something that only happens in 4wd...does the jerk happen while you're accelerating or when your coasting? Does it feel like it's happening when the truck shifts gears?

 

Oh forgot to mention, the driveshaft has like less than1/4” play while truck is in park. Auto trans. Feels like play is coming from front part of driveshaft. Only happens when accelerating. I drive 45-60mph all the time and well I notice it happens a few times in reverse and especially when ac is on. Thanks you.