Ya might check it again. I just had to adjust mine for the 3rd time, finding all shift tabs/arms , nuts loosened up. I knew something was up when neutral side/side operation was real catchy, not lining up and really hard to get out of reverse.
Another prob. I experienced with these boxes was discovering a hairline crack around the input bearing retainer.
Just my .02 to add to the mix. Let us know what it is.