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The GMT800 Silverado/Sierra 1500 and 2500 (non Heavy Duty) (light pickup trucks) were released in 1998 as 1999 models.

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What is the soft gel inside a vehicles ECU?

Inside a Vehicles ECU or TCU there is a soft Gel material for vibration dampening I am assuming. Does anyone know what material this is and where I can get some?

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I believe you are correct and it may be for weatherproofing it too.

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@dompit that is a liquid silicone gel. Many places online sell it as "ECU Gel" check places like this

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Dominic will be eternally grateful.
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