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I saw this news earlier this year: https://theautowire.com/2026/06/12/gm-kills-off-chevys-biggest-silverado-trucks-as-sales-collapse-and-factory-fallout-spreads/ -
And overpriced. I was in the Oshawa Truck Plant when they were being built. Very few. I could count on one hand how many I've seen since
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The 10L90 was used in high horsepower cars and SUVs (higher HP/torque version of 10L80). The HD trucks have the 10L1000 which was co-developed with Allison and is not related to the 10L80/90 which was co-developed with Ford. The 10L1000 replaced the 6L90 used with gas HD trucks in the current generation of the HD trucks. -
I have the 10L80 gas transmission. It rides at 145 or just a tad higher in the heat. Haven't towed with it yet. Both of my trailers are lightweight, 900 - 1500lbs empty, so I won't be pulling a whole lot of weight with it when I do pull them. But given this statement, "Ideal temps for automatic transmissions to do their job the best is 175-220F", what does that mean for our gasser trannies? Are they not operating at ideal temp? Or do those temps only apply to the 10L90 on the HD trucks? -
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At a certain point(maybe not now for you), i just replace them with an OEM part. My opinion is that it will pay for itself in better fuel economy than relying on one that got cleaned with a spray.
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