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  1. #1
    Join Date
    Jul 2007
    Arlington, TX/Queen Creek, AZ

    Default 90 K2500 4-speed to 5-speed

    Hi All,

    Been lurking here off and on for a while, but I think this is my first post.

    I just bought a really nice 1-owner 90 K2500 truck, and it's great except that it has an old fashioned granny low 4-speed and drives like an old 66 I had years ago. I'd like to at least switch it to a 5-speed to get the overdrive. I had a 93 2WD years ago with a 5-speed and it drove more like a car transmission.

    What are my options for the most straightforward swap to a 5-speed? What was stock? I would prefer an NV4500 but don't know if it will bolt up etc..Any advice would be appreciated.

    What would really be awesome would be a Dodge NV5600 swap. Wonder if anybody has ever done that?

    Thanks in advance for any input.

    90 K-2500 reg cab long bed

  2. #2


    The 5 speed will bolt up, If I remember you need the 5 speed clutch, pressure plate, and bell housing also.
    Look at Advanced Adaptors, they were making adaptor kits to put the NV5600 in different trucks.
    A friend of mine runs an NV5600 behind a GM 383 crate motor with a divorced T-case in his Jeep CJ, he bought the adaptors from Advanced.

  3. #3


    Yep, the NV4500 will bolt right up and you will have a great transmission with granny low and overdrive.

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

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