Advice 1986 W900 with (white) 3406b

Discussion in 'Kenworth Forum' started by Roanokemassey, Mar 2, 2024.

  1. Roanokemassey

    Roanokemassey Bobtail Member

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    I found a 1986 W900 flattop sleeper with a 3406b cat (painted white).
    1 owner truck with 450k miles.
    I learned to drive truck in a 1985 W900 that looked like this one.
    I am thinking of a complete resto on it with updates like hub pilot, abs, paint, all new lines and harnesses, ........
    The advice I want has to do with the engine.

    Would I be committing an unforgivibleble sin, if I took out the cat and put in a 14L Detroit?
    I want it to be my daily driver.
    Or should I restore it and just use it for lowboy work where 4.0 to 4.5 mpg is ok pulling heavy wide loads?

    The truck is a diamond in rough condition. Or a money pit. Same thing!

    I just don't want to completely devalue a truck. I am not sure how many white painted cats are out there. I have been told they are getting rare.

    Don't be mean, but give me you thoughts on which direction and why. I am guessing I will have 75k in it, doing a lot of the work myself.
    Thanks
     
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  3. rollin coal

    rollin coal Road Train Member

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    It's an old 1986 truck that come from a fence row. Not really worth more than scrap to most people. Build whatever you want and be happy with it.
     
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  4. AModelCat

    AModelCat Road Train Member

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    White CATs were a Paccar thing IIRC. Just something they did back then. Its not like it really adds any value to a truck.
     
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  5. FLHT

    FLHT Heavy Load Member

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    Was at an Army Depot around Desert Storm time loading rubber water tanks.
    The building next door was wall to wall with white CAT motors In the thousands.
     
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  6. Last Call

    Last Call Road Train Member

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    Don’t ask me to logically give you proof because I can not But I’am a firm believer that a genuine white Cat is a better motor There’s a old saying the difference between a white Cat and a yellow cat is you can make a white cat run .That said I have seen a lot of yellow cats painted white at some point So a guy needs to do his research before he brags about owning a white cat
     
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  7. AModelCat

    AModelCat Road Train Member

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    I haven't heard that before. My 1980 has one and the previous owner from about 30 years ago said it pulled really good back when he owned it. I ran the engine S/N in SIS and its likely the original block in that truck. It was shipped to the KW plant in Burnaby, BC in the late 70s.
     
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  8. Last Call

    Last Call Road Train Member

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    When I started going on the truck in 83 Used to hear the debates about yellow or white Cats then by 86 use to hear the good wrenchs that seemed to know their stuff would say you could make a white cat run I have own both and I would have to agree the white cats would perform better JMO I have a 7fb sitting in the shop that is originally a white cat that someone painted yellow it’s pretty strong
     
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  9. Vampire

    Vampire Medium Load Member

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    I say put the pre egr 14L series 60 Detroit in it if that’s what your gut is telling you. If you’re going to work it and also have it as a daily driver, you could also consider a hopped up 12.7 series 60.

    Other mods, if you’re tall, put in the big hole sleeper. So much more leg room.

    Keep us posted on your progress. Best of luck to you.
     
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