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  #1  
Old 12-24-2009, 05:17 PM
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Default 4:10 gears

i am running my truck with 3:55 gears now with LT285/75 R16 tires. they work my engine pretty good. i am just wondering if i change my gears to 4:10s will my gas mileage decrease or stay about the same or possibly increase?
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Old 12-24-2009, 05:33 PM
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Decrease. You'll be turning more RPM's to achieve the same speed. Unless you need more gear for towing and hauling, I'd stick with the 3.55's.
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Old 12-24-2009, 05:40 PM
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My 08s got the 4.7 and 3.55s and im running 285/70/17s. Itll still roll the tires over with a ltd slip rear... Ill tell you one thing Ive noticed though. If your running the stock exhaust ditch that and youll pick up alot more throttle response than you would think! The factory muffler is very restrictive
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Old 12-24-2009, 05:48 PM
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i have ditched the factory exhaust and now have dual exhaust with just the cat. converter. and also adding to my tires, they are mickey thompson baja mtz's. they are pretty heavy tread. the power is not there to spin them over like i could with the LT 265/75 R16's I used to have. i have also recently pulled a 18 ft car trailer and my truck is just doggy when running it in overdrive without a load even. i have to kick it out of overdrive to have any amount of power.
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Old 12-24-2009, 05:53 PM
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Ya i guess i almost always have mine out of od. Big hills in east tn so i keep it limited to drive. Helps keep the tranny from getting hot too
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Old 12-24-2009, 05:58 PM
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When you upped the tire size, you effectively went from a 31" to a 33" tire.
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Old 12-24-2009, 06:17 PM
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Ya the factory tires on mine were 245s. Guess thats a 30 or 31? And then ran 265s for a while but still wasnt happy with the way it looked so went to 285s which is a 33x11.5 i guess
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Old 12-24-2009, 06:31 PM
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I have 4.10's in my '01 . I went from 32" to 35" to take some of the gear out of it . Now when I climb a bridge to work it downshifts and hangs at 3500 rpm till I crest the top of the bridge . Sucks . I am considering doing a cam change . I have a set of long tube headers that I am going to be installing once the weather gets nicer .
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Old 12-24-2009, 06:33 PM
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this is completly unrelated..but i hope that you don't tow with od on. that will burn the tranny up real nice and fast. back to the subject of spinning tires...a reason the baja's may not spin is look at how much more aggressive the tread is. they are designed to spin as little as possible with a layer of slippery mud under them ya know? just a thought... mine has the anti-spin rear end and it is hard to get it to spin tires with all terrain tires unless you start off squirley.
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Old 12-24-2009, 06:34 PM
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so back to my first question....will changing over to 4:10's decrease my mileage?
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