Thread: 4T65E strange 4th gear shift

Hey, I was wondering when you would show up! The Impy is in limbo right now. My daughter was driving this as a daily until the trans started acting funny. She bought a '10 Corolla to drive, so I let the tags expire on the Impy. I have it listed for sale on C-list, pretty cheap because of the funky 4th, but not much interest. I'm half-heartedly tracking down a recurring evap code, too. Once I get my line pressure gauge fixed I'll see where we stand with a warm trans. Driving this thing will be limited to the back road where I live. The ECM reset seems to have stopped the oscillation, for now anyway. With 244K on the clock it's probably just plain worn out.

Originally Posted by cozwurth

Hey, I was wondering when you would show up! The Impy is in limbo right now. My daughter was driving this as a daily until the trans started acting funny. She bought a '10 Corolla to drive, so I let the tags expire on the Impy. I have it listed for sale on C-list, pretty cheap because of the funky 4th, but not much interest. I'm half-heartedly tracking down a recurring evap code, too. Once I get my line pressure gauge fixed I'll see where we stand with a warm trans. Driving this thing will be limited to the back road where I live. The ECM reset seems to have stopped the oscillation, for now anyway. With 244K on the clock it's probably just plain worn out.

You can use your scan tool to check the trans shift times for each gear. I am not certain of the value but if it exceeds 300ms or so the tcm will command maximum pressure and the trans will slam into 4th. The tansgo shift kit might help but it sounds like your clutch packs are wearing out and it's slipping in 4th. If that's the original trans you certainly have done well with it. Good luck.