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I was changing the oil in our 2022 silverado yesterday and there looked like plenty of room to make a bigger tank. I have to go under the Tahoe for the same in the next couple of days and I'll see if there's even enough room as it's shorter then the silverado.
OK, looking under the Tahoe while I was changing the oil and I don't think a larger tank is going to happen. The DEF tank is on the other side of the drive shaft and takes up a lot of room. I think 25 gallons is all I'm going to get here. My old 96 suburban 6.5 L had a 42 gallon tank! How I would love that!
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