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I recently changed my trans oil cooler lines in my 2010 Tahoe 4-WD, which I've read on these posts that they have been problematic, and I have developed a bad vibration when accelerating. When I hit about 30 MPH the vehicle really shimmies pretty bad then it stops and does it again around 50MPH. At cruising speed it seems to run okay but while I watch the Tach it seems to increase and decrease slightly like the tranny is slipping. Had to unhook front driveline to insert hoses so was thinking that maybe the driveline is not in the correct position but that wouldn't explain the tach moving around. Hard to believe changing the tranny cooler hoses caused a problem, but ... Any input would be appreciated.
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