Buy shudder fix might need to get it from a transmission shop its the torque converter lockup causeing the shudder
I had this problem on my 04 SRX - same thing, going up slight incline @ 30 mph. Like the tranny was fighting to figure out whether to upshift or not. The dealer tried reprogramming the torque converter twice. But that didn't fix it. Then they replaced the torque converter and the problem went away for good. So can I say it was the converter or something else they replaced on the way in/out - who knows.
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I had the same problem. I called Onstar and they said that if the vehicle was shuttering or bumping, pull over and get towed. I as able to move into a car repair facility that said that the transmission was not working. The transmission service company is installing a rebuilt transmission installed so I can get back to my home.
or this... http://www.cadillacforums.com/forums/cad...
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