No gears will engage in

I build turbo 350 transmissions. Can you give me more info? Almost always you will have a reverse as long as you have 9 1/2 quarts of transmission fluid. Now if you do not have reverse or a drive and it is full you have one of two problems. A bad (blown convertor) or the pump gear is broke. The pump usually goes out over a coarse of a week until it can not build pressure. The Convertor is usually the stronger piece and makes a shotgun BANG when it goes out. I really need to know how it was acting a week or two before you just had NOTHING. Can I have the style Lock up / non lock up? The year model would help too.