Differential gears feel really tight

Putting these portal’s together and I’m scratching my head, I haven’t shimmed it or anything and I can already feel that the diff gear mesh is a little too tight. Just not sure If they will wear in with a little time or I’m missing something, I used a caliper to make sure all the bearings were right, As soon as I snug down the diff cover it has quite a bit of drag, definitely doesn’t roll smooth like a RTR any ideas what would make it such a tight fit? With the covers off it feels fine but that’s not ideal