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My truck came with 225/75 15's. I put 31X10.50 15's on it. With the 22RE 5-speed it was a dog with 4:10's in it. I had dumptrucks passing me while going up hills. I recently put 4:56's in it and immediate power increase.It's no longer a dog, but I haven't did a fuel mileage check yet.
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