I've had a transmission shop owner call it 'shutter', which is really annoying to me because 'shudder' describes the symptom perfectly. Reminds my of my BIL, who keeps referring to concrete spalling as 'spalding', even though I've repeatedly told him there is no 'd' in 'spalling' and that Spalding is a brand of volleyball.
I tried the Shudder Fix on our 2012 GMC Acadia, and it seemed to help for a while but the shudder got worse and we had the transmission rebuilt. (As it turned out, the transmission guy isn't any better at transmission repair than he is at spelling, but that's another story.)
The friction modifier makes your transmission fluid more slippery, so the TC doesn't engage quite so quick. If it gets too slippery the clutch plates will start to slip, so I wouldn't recommend adding more. Plus, it takes a few hundred miles for the friction modifier to work its way into the clutch plates.
Back in the nineties, a lot of motorcyclists started using synthetic oils in their bikes. Pretty much all motorcycles (except BMW) use wet clutches, and often the synthetic oils led to clutch slip. As a result, the API came out with a new spec for wet-clutch motorcycles called 'MA'. Synthetic MA oils leave out the friction modifiers.
You may recall back before synthetic gear oil was available, you could buy a special additive to make your limited slip differential engage smoother. That was also a fritction modifier. No longer needed with synthetic gear oil.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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