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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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