my automaic changes gears hard

owners manual says to change trany fluid every 50,000 miles

 

I’ve had this issue before. Truck wasn’t necessarily shifting hard but I cane to a quick stop once and it slammed into gear (honestly thought the dude behind me might have tapped me) had a look and there was a leaking transmission line (super common) it wasn’t completely empty but it was low. I replaced the line and topped it up and I haven’t had a hitch. It’s been about 5 months now

 

It may be a good time to change your fluid and transmission filter.

 

Have you let it warm up fully before driving it? Give that a shot just to see if there is any difference in it shifting? Cost you nothing but a little gas and if that isn't what is causing it, then you can get that idea out of your mind.

 

Resurrected from 7+ year old thread... lol

 

Just realized that lmao