Thanks for the tip. (Eeeek!, lol, aren't I punny!) I found something similar to that gear oil pump locally and it should work just fine.
Once I get the gear oil refilled and other inspections done while it's in the air, I'll take it for a drive and record the audio (or video plus audio if my dashcam will pick up the sound well enough). I'll post that here so it's not so ambiguous as to what the sound is. Agreed on sounds "sounding" different when typed from one guy to another.
Thanks for the help and advice so far. Really appreciate it!