Go back to where you got the trans from. It could be a wire or vacuum line, or linkage adjustment. Maybe the computer has to tell it to shift, and the computer is getting bad info about the engine from a bad sensor or it's not running right.
The 4180e may be having trouble shifting to the second gear probably due to a wiring problem. There may also be a problem in the gearbox. You need to take it to a professional mechanic so that he can identify the problem and fix it.