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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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"But when its at 4000 rpm in any gear, I think its the tranny"
I'd say you're thinking clearly on that. A U-joint would be very speed dependent.
When bearings go, not only do they make noise, but the gears don't mesh as they should . . . all kinds of noises happen.
Also, i've had a clutch pressure-plate be responsible for vibrating/hammering noises at rev's.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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