440 Automatic. What gears are you running?

converter??
Not sure if if the TC is stock. Somewhat tight. It was in the car when I got it. A few weights welded on by someone other than Mopar. B&M shift kit. Shifts 1st to 2nd with no slip and a slight bang at any speed. If you jump on it she leaves 20 feet or so of rubber and rear of car slides left a bit, bangs into 2nd along with a foot or two of rubber and a little rear slide to the left. 2nd to 3rd is firm but no wheel spin.