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Transmission Temperature


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Just traded in my older sierra for a new one. The new one has the transmission temperature readout in the dash and I was just curious what temperature range should be a cause for concern. 1/2 ton sierra that I pull a 17.5ft fiberglass tiller. So far it seems to average around 140f down the highway and 155f or so right after launching/loading etc.

Mostly just curious as I have heard that heat is what kills trannies.

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