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sounds like your transmission is under too much distress.

is tow from dealer or after market, no i do not work for dealer ships... trucks without tow packages have issues with towing due to heating issues.

get 2 opinions from 2 transmission shops if possible.

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have your wheels aligned and balanced. while they're at it have them check your pitman/idler arms and tie rods for excess wear.

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Have a 1990 1500 long bed extended cab had similar problem, tires balanced no bent wheels, no bad universal joints or motor mounts.........finally found transmission mount was broken in two, wold only shimmy at about 45-55 mph in normal drive on flat level road either just slightly accelerating or decelrating..........ended up finding it with a laptop and usb ball camera hanging under truck to watch driveline while in motion, saw the tail shaft shaking and lifting.........got her home and threw a jack under the tail and sure enough mount was broken, replaced..........smooth as glass now

Have used the camera ball a couple of time for different problems, especially those hard to find ones like partially blocked cat or bad ball joint..........

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Q: Why does my 1985 Silverado truck with automatic transmission shake in front when under power only in high gear between 45 and 55 mph?
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