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Hello, thanks for posting
The mechanic that told you ro have the driveshaft balanced may be right, this has a two piece driveshaft with a center support bearing, the bearing may be the problem or it's just out of balance. That's my opinion on this.
Thanks for the reply,
Yes both parts of the driveshaft should be balanced and "phased" meaning the u joints have to be aligned correctly with one another, the driveline specialist will be able to determine if the center bearing is faulty. As with any rotating component there are dynamics involved this is why it may not have the same frequency of the vibration at a different rotational speed. So if the vibration is only there while driving and at certain speeds and can be felt in the frame and seats I would go to the driveshaft first.
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Thanks for that update, the only thing that would cause this in the transmission is the torque converter, it's the largest rotating part in there. it would be a matterof removing the transmission and replacing the torque converter, probably looking at a bill of around $1200 part and labor. Personally I have not experienced this same issue at work in the past.
300K is about right , after that the engine may need some attention, besides brakes and regular maintenance, the V8 is a pretty trouble free engine but it does have a timing belt which should be replaced at every 100K miles and it's a good idea to change the water pump at the same time.
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