What could be causing this

[Travis K]

I am having two problems with my truck:
1.) When I start the truck, the starter turns really slow and sounds like it is being bogged down. The battery and starter are both new. It is not grinding at all, and the truck eventually starts, it just does not sound healthy. Could the starter be too close to the flywheel and be pressing on it or something?

2.) After the truck is started, it stalls when I shift it into gear and a load gets put on the motor. The tranny is a new rebuilt TH350, and the converter is brand new.

Any help here would be great.