No, I haven't installed the pump on the car yet. Do you think that could be the problem?
Seriously, I suppose the pump could be bad but it was working before the gear box rebuild. When I filled it with fluid and ran the engine it got low on fluid (from pumping it to the gear box) for about 20 seconds and got noisy before I added fluid to the res. again but I don't think that 20 seconds is long enough to ruin the pump. Could be wrong, though.