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15-40 will work just fine.

I guess we can agree to disagree but the dex is not a good thing if you heavy use these trucks. I also agree I don't like the heavy 2nd to first shift but it's a truck not a prius. But adjusting shift cable will help with that.

Here's my take on this subject when I had to change transmission on a truck I talked with a Allison service guy not one that stands behind a counter but one who takes these apart. He had to take my converter apart And clean and check it because the converter that came with...