We don't pound the trans together.. Find out why it's binding. This why l don't recommend replacing all bushings; they can become distorted. That bushing will fry without correct clearance. The direct drum is not fully engaged in the sun gear shell probably because one of the forward frictions are not engaged with the splines. Remove the front drums and band and remove the clutches and reinstall the drums and pump without the pump oring or band. Then check endplay. Also check the bottom forward friction for damage on the teeth. But first get that direct bushing clearance straightened out.