Chevy 6.0L

What is everyones thoughts on this engine? Like in a '03 1500HD.

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Pleanty of power for towing or what ever work you might need it to do...The highway mileage empty is about 14 to 15 at best. Towing a travel trailer won't drop that down much though, if the trailer isn't huge, you'll get around 11 mpg.
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This is too broad a statement to really be accurate. While the 6.0 is a good motor, it has its limitations. When determining its towing abilty you must factor in its towing abilty by the terrain and trailer type you plan to tow. A 4.10 should be considered the minimum axle ratio you want and do not waste time with a 3.73 as contray to populat belief you will not gain any MPG with it towing or not with OD. Also it is quite possible to pull a 30 foot plus trailer with one IF it is properly geared. With aftermarket 4.56, it will tow a heavy load quite well. Up untill 2000 in old body style trucks GM offered a 4.56 in 350 and 454 powered trucks but they dropped it in new body style to make the Dmax and 8.1 more atractive and profitable. ALso, you must consider tire size too for if you plan to run oversized tires, this reduces your effect axle ratio and towing power and you need to regear to get it back as no magic chip, exhaust or airfilter will restore it.. One more thing, staring in 06, GM offered a Allision option with the 6.0 which would give you a deeper first geat (3.1 vs 2.48) and a reveerse gear that is more than twice as deep as in the 4L80 that comes with 6.0 by default. One final comment, the 6.0 pulls a LOT better on 89 octane or better fuel as 87 is not enough as the ECM retards the spark before you here the knock which reducing pulling power and MPG when it is working hard. ----------------- The SnoMan www.thesnoman.com
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fifth-wheel OK. Couldn't keep it in OD with the AC on even on flats. Tranny never got hot, but it just didn't have the torque. It did OK climbing the mountains in TN. There were times it liked to drop clear back to second when only rolling around 55 MPH and hitting a good hill. Ended up moving up to an 8.1L w/ 4.10 in another '02 2500HD. This move was partly for the engine and also for the long box, a short box is a waste of space, and then decided while going that far to just get the crew to be set for many years to come.
The 8.1L w/ 4x4 gets right around 11 MPG city/hwy and towing drops to anywhere between 8 and 10 MPG. If you won't be towing anything large, the 6.0L will git 'er done and be easier on your wallet!
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I get 16 Hwy with my 01 2500HD 4.10 rear end. Pulling a car trailer with a vette on it gets about 12. No problems so far, knock knock on wood.
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I have an 6.0 03 1500HD crew cab and a love it. I don't pull anything too heavy just a four place trailer with atvs. I get about 14-16 mpg hwy on 87 octane. She got some power with a power programmer though
-- Amanda Lynn
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In an 06 crew 1500HD...no legitimate complaints...within it's capacity, wonderful motor...

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