pull the front driveshaft off, and then drive it. I just had the same thing happen to mine. It takes ten minutes to get the driveshaft off. My front drive flange in the Tcase has play and the bearing is bad. I will be dropping the case and replacing the case and rebuilding mine for a spare later. It drives really good without the front shaft now.
My 931A2 (RRAD rebuild 2005) had this exact same problem; removed the front driveshaft & found that the front output shaft was broken off inside T-case, and pieces were lying on bottom inside case (per
98G I put some strong magnets on bottom of case to hold them in place while driving). Noises similar to OP's were from remaining ball bearings rattling around inside bearing carrier....about half of the ball bearings were rolling around inside the bottom of the T-case, I fished around for about 30 minutes with a magnetic parts finder to try to remove all the shavings/pieces I could.
Simp5782 hooked me up with a good take-out T-case to replace it with.
While searching around for replacement parts, it seems that these things are virtually impossible to find parts for. Oshkosh Equipment listed some of them, but then told me that they were subject to minimum-quantity requirements and would be pretty expensive to tool up a run for.