What did I do wrong? FIXED IT!!

Is it possible to install the pump cover on the housing wrong and that effect the engaging of the forward gears?

As far as the rest goes, remember I only took the pump out and adjusted the front band. So any problem should be related to that area.

If the converter is not seated properly I doubt I would be able to spin it after bolting up the tranny to the engine.

Jack
When you reinstalled the front pump-house into the tranny, you had to engage at least 3 seal-rings; 2 on the reaction support and 1 on the input shaft. From the factory these are made of cast-iron and come with interlocking ends that are nearly impossible to snag and break. During a past rebuild,these may have been replaced with Teflon split rings, that do not have the interlocks.
These can be very tricky to properly engage.I usually take them over to the anvil, and smash them a few times before throwing them away. Then I put the oem stuff back in,lol. I hate those squirmy Teflon noodles.