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auto's tq multiply, that why stock trucks always tow rate for more with an auto, so it should be easier on an auto then a manual. not to be an @ss but you could have just clicked on snapshots a ton of trucks run a bl and 33's here
Mine is an auto but it still drive fine. If anything it will help your mileage just a tad. You won't be turning quite as many RPM's at cruising speed now.
If your doing this to your truck it's works great for a dd. When ever I get rcd lift and bl on with 35's I'll be using that as my dd. My gas is gonna suck a bit but it will still be my dd so you should be good with 33's