I took my truck back to the dealer to have some dents removed (part of the purchase) When I dropped it off to told them I wanted them to check the trans as it was doing the hard down shift thing. What follows is the tech notes from the invoice:
c/s the trans clunks when it downshifts from above 45mph.
ck trans fluid. red and full. ck for codes. found no codes. ck cvis. ok withink speck. road tested. found trans had harsh downshift at 55 to 50 and harsh upshift again at 50 to 55. ck for software updates. found TSB 18-035-07 to reprogram tcm.
reprogrammed tcm. quick learned tcm. road tested. trans is now shifting within spec. mo 35523
Not sure where the 50-55 thing came from. I explained that it was happening for me at 25-28. They kept the truck over night and tested it again the next day. They drove it ~20-25 miles.
So far it seems that the update did fix the shift problem I was having. They also did a recall fix at the same time. It was recall j05 egr diagnostic monitor updated pcm
not sure if that had anything to do with it, just an FYI.
Hope the issue doesn't come back, and I hope you folks get your issue resolved.
Last edited by azdecals; 05-06-2009 at 02:57 PM.