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  1. #1
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    Kenworth T660 vs T680 vs T700

    Hi guys
    We are about to pick a Kenworth truck but stuck between the T660, T680, and the T700. What is the main difference between the three? All we can find is the cab size and the T680 is a little more aerodynamics. We are also thinking of picking a Ultrashift with a ratio of 3.55, and we are planning on pulling a 8 car trailer. Will this combo with a Cummins ISX 550 eng? Will the 425HP be enough to pull 8 cars cross country?


    Thank you so much

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    Medium Load Member Casual Trucker's Avatar
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    Any engine above 400 Hp will pull 80,000 Lb Gross Wt. the more horse power you add the worse MPG you will get some times when you have the truck on cruise control and the engine needs to drop a gear to stay in the green zone the higher the HP the less likely the engine will drop that gear and it will continue to pull @ higher RPM which will Drop the fuel millage of the engine. If you want the Higher HP then you really need to skip the cruise control as much as possible.
    The best way to buy higher HP engine and keep the cost down is to get the 550 hp and then Govern the engine to 450 hp this way the engine will last a long time & the MPG will be @ best and that's my story & I'm stickin to it 10/10

  3. #3
    Road Train Member scottied67's Avatar
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    Currently driving the T660 2010 Areodyne for 2 years. Very small inside but quite maneuverable. Have heard the T700 is just a T2000 with a high ceiling.
    Took a tour of the T680 the other day, nice compromise between the other 2 models, more open inside the sleeper, nice layout etc. Main thing I did not like lol was the lack of deep little pen/pencil cubby hole in the dash where I keep some pens in my truck now. T680 does have little cubby hole in dash but they are only a couple inches deep? I cannot see anything someone could put in there that will stay in there.

    By the way, I was in the KW shop getting a new defrost/A/C fan put in. The lounge was full of drivers with the newer DEF trucks waiting for their trucks to be worked on, informal survey, most of them were for emissions work and 2 guys were for driver door problems like one guy said he used the key fob lock/unlock and now door will not open at all and the other guy said his door is so bad out of alignment he's afraid to open it because it is too hard to close so these guys enter/exit out the passenger door.

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    Quote Originally Posted by Casual Trucker View Post
    Any engine above 400 Hp will pull 80,000 Lb Gross Wt. the more horse power you add the worse MPG you will get some times when you have the truck on cruise control and the engine needs to drop a gear to stay in the green zone the higher the HP the less likely the engine will drop that gear and it will continue to pull @ higher RPM which will Drop the fuel millage of the engine. If you want the Higher HP then you really need to skip the cruise control as much as possible.
    The best way to buy higher HP engine and keep the cost down is to get the 550 hp and then Govern the engine to 450 hp this way the engine will last a long time & the MPG will be @ best and that's my story & I'm stickin to it 10/10

    wow, that is bad information.....

    Castrate the truck, you will lug it to pull a hill. Lugging the engine will kill your MPG faster than having it turned up to the max power setting.

    You want to get better mileage, watch your start and stops, try to avoid sudden jack-rabbit starts especially. Don't feel compelled to drive faster/slower than the sweet spot that the engine/driveline is set-up for. On the newer engines, that's around 1300 RPM.

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  6. #5
    dgc
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    Light Load Member dgc's Avatar
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    I agree, you want max hp and keep it in the sweet spot

    Quote Originally Posted by MNdriver View Post
    wow, that is bad information.....

    Castrate the truck, you will lug it to pull a hill. Lugging the engine will kill your MPG faster than having it turned up to the max power setting.

    You want to get better mileage, watch your start and stops, try to avoid sudden jack-rabbit starts especially. Don't feel compelled to drive faster/slower than the sweet spot that the engine/driveline is set-up for. On the newer engines, that's around 1300 RPM.

  7. #6
    Bobtail Member lostriver's Avatar
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    Quote Originally Posted by Casual Trucker View Post
    some times when you have the truck on cruise control and the engine needs to drop a gear to stay in the green zone the higher the HP the less likely the engine will drop that gear and it will continue to pull @ higher RPM which will Drop the fuel millage of the engine. 10
    #1- Have you ever driven a truck?

    #2- Puncuation is your friend.

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  9. #7
    Bobtail Member starbulk's Avatar
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    Quote Originally Posted by SemiMan View Post
    Hi guys
    We are about to pick a Kenworth truck but stuck between the T660, T680, and the T700. What is the main difference between the three? All we can find is the cab size and the T680 is a little more aerodynamics. We are also thinking of picking a Ultrashift with a ratio of 3.55, and we are planning on pulling a 8 car trailer. Will this combo with a Cummins ISX 550 eng? Will the 425HP be enough to pull 8 cars cross country?


    Thank you so much
    You are really down to a personal preference in my opinion. Pulling cars I'm guessing you are not going to be pulling the mountains of WV, MD, and PA very much? The only place you really need more HP is in the hills. What is going to be your primary operating area? Plan on going to California? Make sure you invest your money wisely for CARB regulations . I have 435HP, and except on those rare days I decide to run US 219 in PA or I-68 across western Maryland, I have no problems going anywhere. When loaded, I gross between 78-79k. You should be fine with 425HP as long as you stay out of the throttle. As for aerodynamics, are you pulling an open rack or an enclosed? Unless you are pulling enclosed, I can't imagine aerodynamics are going to help much, an open rack is going to drag when loaded I would imagine.

  10. #8
    Crusty old ###### Cranky Yankee's Avatar
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    my 2011 kw700 with a paccar engine 238000 miles has never had a def or door issue

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  12. #9
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    anybody know the warranty on a brand new 2013 truck from kenworth? We read that it is 1 year/100,000 miles. Is that it? Why so low?

  13. #10
    Bobtail Member
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    In Canada I just spoke to Kenworth and it was 2 Yr 250,000 miles

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