I'm debating doing this in the next few weeks so you went up to 12.5 MPG on 37s on the H2 ? My Tire size is 37x12.50 x17. I won't be going bigger so I've been debating on 4.56 or 4.88. Max I tow is around 3K and I'm trying to improve the current power I have, and the transmission /overdrive...
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