I've had it with this 904, about to give up!

gremlin said

Would the piston seal in the front drum do this? I put one in one time and it felt funny so I pulled the piston back out and the seal had kinda rolled up the other way. Just a thought. If I read this right, you are on your 2nd VB so I wouldn't think it would be in that.

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Well,,, he said he air tested it and that would def show in an air chk.
(Assuming a person knew what they were hearing) No offence meant.

And a heavier spring in the accumulator wouldn't cause it, as it would just shift a little firmer as if you blocked it.

It almost has to be a mainline pressure issue in the pump or downstream from it. (shift flares and sometimes no engage)

And Pishta might be on to something.
There wan't any issues with the filter was there?