i had a problem not with mesh but with the case itself with teh gears rubbing. i cleaned it out real good and put only the input shaft in and held it tight together and spun it then took 180 grit sandpaper and an exacto and trimmed and sanded till there were no rub marks. then put the next shaft in and same thing had to sand and trim. lastly my output bevel gear.(the big one) i had to actualy sand the back side of it down because it was causing a bind on the smaller bevel gear. it took me a couple hours but in the end there is no resistance anymore in my tranny.