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 - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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