Auto Tran hard shifting problem
 

Hey everyone been some time since my last post.
I have been experiencing had shifting in my 00 auto v6. I've had the diablo sport tuner on the car for over 6 years now. As you know it firms up the shifts. But the last year or so its been really rough and slams into gears even when just cruzing. I removed the tune for about 2 months now. I still have very hard shifting but usually only in first to second.

What could be the problem?

To be honest I dont think the car has EVER had the transmission fluid replaced.

any help is appreciated

I have a 2000 gt auto. And mine shifts hard from first to second. Someone told me that how ford makes them.

have you been driving hard at all. ?