Hello all and good day. I recently purchased a 2007 300C AWD around 4 months ago. 70k miles. It drove awesome up until I decided to have a bunch of regular maintenance done. Coolant flush, serp belt, plugs, tranny filter. On my way home I noticed it was downshifting hard. Called dealer and they said they would charge me to do a quick learn. I opted to just drive it. 2500 miles later still doing it. Sounds like it's coming from right rear.
Took into a different dealer in my town and they tore it all apart to find a nut had backed off the output flange of my transmission. $800 later I got the car back. Shifted nice for about 2 miles and sound is back. Took it back to them and charged me to look at it again. Couldn't find anything else wrong. Next thing they wanted is $4k for a new transfer case. I can shift in autostick and get it to eliminate problem but it's still there. Up shifts are fine. It's just on the initial downshift from 4-3 usually around 20mph while braking. Who has any ideas ???
Took into a different dealer in my town and they tore it all apart to find a nut had backed off the output flange of my transmission. $800 later I got the car back. Shifted nice for about 2 miles and sound is back. Took it back to them and charged me to look at it again. Couldn't find anything else wrong. Next thing they wanted is $4k for a new transfer case. I can shift in autostick and get it to eliminate problem but it's still there. Up shifts are fine. It's just on the initial downshift from 4-3 usually around 20mph while braking. Who has any ideas ???