If the hard shifting only occurs when the engine temp gauge shows over 200 degrees, the valve body needs replaced. 2000 M.Y. had horrible transmissions.planetary breakage is common.contact Fleet Transmissions in Roanoke Va.540-982-1419,wwwfleettrans.com
Check the fluid level first clarck the transmisson line loose at the radiator and make sure oil is flowing thru the cooler if it is then you have a problem that will have to be tested at a transmisson shop, there are to many thigs to list that would cause hard shifting but have it checked before you damage any interal parts because if you damage hard parts the fix gets more expensive.
Testimonial: "Thanks for your time. I have one more question though why would it only shift hard sometimes? It seems like if it sits for a little while it fine. "
It could be anything, it might be the tork converter lock up clutch malfunctioning or it could be a plugged port for a shifting solinoid, if they did not drain all the fluid and filter and add lucas transmisson condtioner it would make the clutchs grab hard, sort of like putting on bycycle brakes when you get them wet they don't grab but when dry they grab very hard.
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