03 voyager tranny problem

I have an 03 Chrysler Voyager with 3.3l and auto trans with 59k on it. Its not driven alot, once a week, and the 4-3 downshift has a hard bump now. The fluid has recently been changed, and no warning lights. What could be causing this? Any help would be greatly appreciated.

May want to swing by a tranny shop and have them scan the Transmission Control Module (TCM) for transmission fault codes and check the Clutch Volume Index (CVI) numbers. The CVIs indicate clutch wear. It takes a special scanner to do it. This could be an internal problem or a problem with the solenoid pack. If it's the pack you can DIY it. A new pack runs around $150. If it's internal it's time for a rebuild. You changed the filter and used ATF+4 fluid correct?

Did a little pokin around. There is a TSB published for your specific problem for 2003 Chrysler minivans. It's number 21-006-03 and involves reprogramming the TCM. Just can't find the narrative for details.

So update on the trans. I took it in to the dealer, they did a diagnostic on it, no codes, AVI numbers came back ok. They did do the update, and that seemed to fix it. Thanks for your input RIP!!

Glad to hear it and thanks for posting the fix. Buy me a beer sometime...