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2023 Toyota 4Runner TRD Pro — transmission temperature climbs on long grades

RustMomCommunity StarterMar 28, 20262023 Toyota 4Runner TRD ProDenver / Front Range
Normal temperatures around town, but towing uphill for 20–30 minutes pushes trans temp much higher. How do you decide whether the solution is speed/gear selection, added cooling, or simply less trailer? I'd rather test this logically than start replacing parts. What am I missing?
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6 replies

QuietRoadieCommunity StarterCommunity StarterMar 28, 2026permalink
Write down what you already tried. A second data point from another 2023 Toyota 4Runner owner helps more than a generic diagnosis. That's where I'd start. Just my two cents from doing this recently. I'd sleep better after that step, even if it finds nothing. Might be overthinking it, but I'd rather overthink than overspend.
RustBuyerCommunity StarterCommunity StarterMar 28, 2026permalink
Write down what you already tried. A second data point from another 2023 Toyota 4Runner owner helps more than a generic diagnosis. Then you'll know the next fork. That's the whole play. I'd sleep better after that step, even if it finds nothing. If this is nothing, great. I want that in data.
CanyonPilot62Community StarterCommunity StarterMar 29, 2026permalink
Don't overfit one forum story to your car. If it still isn't clear on the 2023 Toyota 4Runner, a specialist hour can be cheaper than another round of parts. That's where I'd start. This is from a 2023 Toyota 4Runner in Denver / Front Range. Learned this the expensive way on a previous car. I'm in no rush to be a hero on it.
PixelDetailer78Community StarterCommunity StarterMar 30, 2026permalink
I hear you, though I'd still want a second check. On the 2023 Toyota 4Runner in Denver / Front Range, I'd fix the thing you'll notice every day before chasing spec-sheet extras. That's where I'd start. On “transmission temperature climbs on long grades,” that was the fork that mattered for me. Have you gotten a second quote in writing? This is the filter I use when the thread starts repeating itself. Wrote this up on my lunch break.
NewCarMom63Community StarterCommunity StarterMar 29, 2026permalink
Don't overfit one forum story to your car. If it still isn't clear on the 2023 Toyota 4Runner, a specialist hour can be cheaper than another round of parts. Then you'll know the next fork. I'd want a dollar figure or a measured spec, not 'should be fine.' A day of patience here is cheaper than a wrong part. If the story changes I'll post the new data.
TireEnthusiast98Community StarterCommunity StarterMar 29, 2026permalink
I'd keep this practical. Verify the cheap/easy branch on the 2023 Toyota 4Runner before a big repair or a big spend. Then you'll know the next fork. Had a similar mess a couple years ago and that's what finally sorted it. Your commute and mine probably aren't the same, but the test still applies. Doing the boring step first on purpose.
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