Originally Posted by stevebaz
Do you have over size tires
Originally Posted by cpaharley2008
I think my rear is 3:55 and I do have 20" tires/rims.
20" wheels are factory stock for at least some 2013 Ram 1500 models
, so if it has the right tires
they are not oversize for the factory's choice of gearing. Also, the stock 20" size appears to be P275/60R20, only 10 mm wider than the base equipment of P265/70R17. Even 10mm can add drag, but I don't think it's Jim's issue with fuel economy.
All of these tires
, of course, are huge compared to pickup truck tires of a few years ago.
3.55:1 appears to be the stock rear end ratio, regardless of tire size or engine.