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Th 400 transmission (operating range)

Discussion in 'Chevy Truck Talk & GM News' started by kingriver, Dec 28, 2011.

  1. kingriver

    kingriver New Member

    I am thinking about plowing snow with a 1990 GMC 2500 - 350 V-8 - 4 x 4 - Suburban. It has a TH-400 transmission in it. I have been searching the web for the transmission operating range, seems everyone has different opinions. Am I correct in assuming that the normal operating temperature of this transmission is between 175 - 225. Normal operating range at about 210 ? I have installed a transmission cooler and fan, and a new Glowshift digitial guage.

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