First of all, I really appreciate everybodys response to my questions.
I'm no expert, but here's what I think is going on. Last year, I started hearing a "whirring" of the gears at low speed (except 4th). Over time it became louder ... I became aware of the TSB regarding the need to raise the oil filler hole location on the tranny case because, not having enough oil to cover the gears could cause excessive wear of the gears. Well, I immediately added additonal oil to the box by "tipping" my rig. I was able to get a whole lot more oil in, and things quieted down some. But, within 6 mos, the 'growling" came back and now it's louder than ever. This is not a throw-out bearing or clutch sound. I had a mechanic friend of mine listen to it and he says it sounds like worn gears.
So, that's why I'm shopping for an honest, experienced tranny shop to R&R the GB, and either rebuild or repalce it.
If there's anybody on the forum that's had some good experiences up here in my area, I'd sure like to hear from you. I miss driven my rig. I'm afraid I'll cause some catastrophic damage at this stage so she sets in the garage.
Thanks again for your input... deeply appreciated.
Chuck