need tranny help..............

[69 air cab]

I have an 84 Silverado, 350/350. I just finished installing a new 350 engine. The tranny was pouring fluid out before replacement but was shifting fine.........well..........shifting ok. So........I replaced the filter and modulator, and seals and install her with a new torque converter (at the advice of the previous owner who is a friend).

Today I was going to drive it for the first time and I had to give it a good bit of gas to get it to go in both rev. and drive. I did not even go 25 feet with it and shut it off.
I called a tranny shop and they told me to pull the converter bolts to see if the converter is turning freely first. It did turn free. I called the tranny shop back and he said it sounded like the pump had gone bad.............if I take it to him he will rebuild for $450 with 6 month war.

I did fail to tell him i did over fill it as much as about 1/2" on the dip stick.
Can you all think of anything else it might be before I put that baby back out?