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2016 Silverado 5.3 normal operating trans temp?


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My 5.3 has 66k and the transmission  has never been serviced. Truck drives fine but I notice a squeal or pitch noise that I think is coming from the trans. I also noticed it only starts after the temp gets around 180. Highest it has gotten that I noticed was 192 but dropped down to 190. Doesn’t sound like metal to metal just more like a low pitch. I have a scheduled appointment for next week to have it flushed but curious to what the normal temp should be. I’m also positive I never seen it climb past 175. 

Edited by Rickyace09
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Normal temp is going to be around 180-200 degrees once fully warm. These transmission have a thermostat on them that will keep the temp up that high. A lot of guys will remove the thermostat so it runs 30-40 degrees cooler all the time.

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Mine regularly hits 220+ on long road trips. No towing, no heavy loads, but usually outside air temp of 85+. This summer saw 110 outside temps get fluid to 240. Around town, short trips, I see 170-185. Dealer swaped fluid for studder problem. 

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If you added big tires that could change the shift patterns and be a reason for higher trans temps,  working harder etc.

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50 minutes ago, ftwhite said:

Mine regularly hits 220+ on long road trips. No towing, no heavy loads, but usually outside air temp of 85+. This summer saw 110 outside temps get fluid to 240. Around town, short trips, I see 170-185. Dealer swaped fluid for studder problem. 

Seems pretty high to me

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