TR 3650 Reverse Idler noise

I am in the process of putting bearings in my TR3650 I was wondering if anyone has torn one of these a part and spun the reverse idler gear and herd a loud rattle sound. I had a vibration in the transmission and I am looking for any culprits. . Any one have any experience with this. Thanks in Advance. And yes I am a Newbie
 
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