Input shaft bearing noise?

I just recently flew to Washington to buy a 91 rt4wd. When I test drove it I noticed some vibration in 2nd gear. Now it seems to be getting worse. Its is a grinding/vibrating feeling and noise coming from the front of the car and through the pedals under load it gets worse. Near idle it goes away, and it only happens through certain RPM ranges (around 3000 rpm it starts and goes away by 4500 or so) I can notice it in every gear If the load is right. I can hear a slight whirring noise if I’m sitting in nuetral and let out the clutch. I’m leaning towards input shaft bearing? Any other ideas? Everything else about the tranny works great, absolutely no grinds, id like to fix it if I can, but not sure where to find the bearing or seal?


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