A904-No first gear with a Turbo Action Valve Body

My A904 was working great.Has a Turbo Action pro street valve body.Part # 17676.Would shift threw all the gears no problem.Now when put into 1st gear the car act like the brakes are on.Will not move.2nd gear acts the same as 3rd gear.No RPM change.Fluid level good and condition is good.Drop the pan and had a look at the filter.Looked good,but replaced anyway.This trans was in the car when I bought it along with the valve body,so dont know much about it.Any ideas about what I should be looking for/at.