The stuff I used was Lubegard Instant Shudder Fixx, you can buy it at AutoZone for ten bucks.
I believed it helped, but I've only towed the boat a few miles since then, so the car hasn't had a real workout. I flew back from Florida a week after using the stuff, and it supposedly takes about 200 miles for the snake oil to do its magic. My wife drove the car for a couple of weeks after I left, then she flew back as well. She said she thinks there's still a shudder, but I think it has helped. I'll know for sure when we go back to Florida in January and I'm able to drive the car some more.
I wouldn't hesitate to use it on another vehicle. It certainly hasn't hurt anything, and the alternative is taking the car into a transmission shop for a new torque converter or worse. This was on a 2012 GMC Acadia, BTW.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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