QUOTE(vpxdemon @ Jul 31 2008, 05:23 AM)
I have a 2005 automatic, and mine has a problem shifting into 3rd as well. It will rattle the whole car unless I lift off the gas just before it shifts. They replaced the transmission after 5K miles but that didn't solve the problem. They flashed the software on the shiftronix and it was fine for a year, until I reached across the car to grab something and knocked the car into manual shifting. I moved the shifter back over and it immediately went into the problem of shifting to third again.
I finally just gave up.
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That's really not the same problem though. Auto trannies don't have clutches or syncros, so it's not really related. That is a strange problem though, and sounds like it has something to do with the Shiftronic since it happens after you move it over there.