Hello everyone, We're having a howl/gear noise from our dual range cylinder drive gearbox. It's had it since we bought it used and we removed it before wheat harvest and had it gone through with nothing found wrong. No shavings, bad bearings, pins, gears, or anything. A couple of new bearings were installed and we re-installed it onto the 9600. We tried it out when we harvested wheat and it still had the loud whine/gear noise it always had. The intermediate drive sheave has a howl too and we plan to re-bearing and re-cam it soon. Will this sound transfer to the dual range? It (gearbox) doesn't do this when running direct. Are these naturally noisy? Our old 7720 T2 didn't make a sound in 4600 hrs. Any comments would be great. Thank you in advance.