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I have a 96 sierra 1500 5.7 and whenever I get around 50 mph my truck starts to shake. It happens when it is at low rpms. I have changed all the steering components and rotated and balanced the tires. I also added the anti shudder additive to the transmission. I'm still having the problem I've been told It may be the torque converter. Any ideas what It could be?
 

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Check the driveshaft for excessive play in the u-joints. Also check the transmission mount and transmission and transfer case mounting areas. Put it on jackstands (all four wheels) and put in in drive to see if theres something in the driveline causing the vibration.
 
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