[MAH77]

I just bought a 69 with a 901, in first gear once I start moving it howls loudly under acceleration and even worse when I’m coasting, it gets steadily quieter as I shift up through the gears. I’m not too familiar with the 901; is this the bearing closest to 1st that needs to be replaced? If so, i’ve looked but can’t find a rebuild guide for a 901,is it the same to rebuild as the 915?

Thanks,
Milan