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I would check the drive shaft. If there is a binding U joint or an issue with the carrier bearing it would cause the transmission to vibrate. If the issue is internal then the front diff and transmission pan should be drained and inspected for metal filings. I personally would start with the rear drive shaft as a cause. Take it right out and inspect the joints.
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Sorry for the delay.
The labor for checking the driveshaft and bearing should only run about 1.0 hours,
Then if the shaft or bearing is the culprit you will be looking at replacing the driveshaft. Usually it's best to go with a used one, last used one we did was about $350 for the shaft. The u joints cannot be replaced on these.
If this condition is only happening on fairly tight turns, then it could be an issue with the center differential on the transmission. This type of repair runs about $850