I have a borg warner transmission bolted up to 210 hp perkins diesel in my boat. Unfortunately there is no name plate on the tranny to identify its model. Are there any notable visual characteristics that I can look for that will help me identify the model type? I think it is a 71 or a 72 series and it is pushing a slow, heavy displacement lobsterboat hull. Also, I have noticed that there is a little lag or delay time between when I shift into gear and when the actual shift takes place. Any suggestion what is causing this and what the remedy is. Also what are the recommended tranny fluids for a 71 and a 72 series BW tranny?