Check the threads. Period 300e's would not up shift due to the governor drive failing and losing pressure. If this is the same set up, it can be observed by removing the left rear disc cover to reveal the flyball governor. Jack up a rear wheel and kick it with your foot and observe the governor. It should turn with the driveshaft rotation. If not, it is a transmission pull and diagnostic to see what broke the $3 drive gear. It could be other things, but if it never up shifts, then check the governor.