Helping a buddy with a race car and we're a little puzzled over the large drop in RPM from neutral to first gear. The engine idles around 1800 in neutral but drops to 1300 or 1400 in gear. It is a big engine, close to 600 inches so it has plenty of torque. The converter stalls around 6300 to 6500 rpm going down the track. Transmission is an ATI TH400 full race setup. I told him to call ATI and see what they say but thought I'd ask here too. In my past experience the RPM drop going into gear was usually around 200 or 300 RPM, not 500+. Not sure if this is a transmission issue or something else.