Posted by MarkB_MI on November 11, 2021 at 01:40:07 from (174.245.17.229):
We kept our 2012 Acadia after buying a new car for my wife. It has about 120K on it but is still in good shape. Our plan has been to use it to tow our 18 foot center console boat down to Florida this fall, then leave the car at our condo for the winter. I did a fair amount of work to get the Acadia in shape before we left, including a new windshield, polishing the headlamp lenses, new struts and changing the fluids in all the gearboxes.
The Acadia has developed a bit of shudder at around 30 mph, which I figure is probably the torque converter failing to lock up smoothly. Changing the transmission fluid (half the fluid, anyway) didn't seem to help. As we made out way down to Florida pulling the 3000 pound boat and trailer, the shudder got progressively worse. By the time we arrived in Tarpon Springs, it was seriously shaking the car.
I assumed I'd have to take the car into a transmission shop, but figured I'd try some snake oil first. Since the next step would be a teardown and the fluid would get changed then, I had nothing to lose by using an additive. Most of the automatic transmission additives seem to be stop leaks, which I definitely didn't need, but I found a product called 'Lubegard Instant Shudder Fixx' at AutoZone. It supposedly contains friction modifiers and is specifically intended to fix shudder. I comes in a 2 ounce tube, so I didn't have to worry about overfilling the tranny. I bought a tube and added it to the transmission fluid.
After adding the Lubegard, the shudder quickly improved. After a week it was pretty much gone; I pulled the boat for a few miles and couldn't detect any shudder. The real test will come this spring when we tow the boat back north. I'm skeptical about snake oil additives, but this product seems to work as advertised.
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