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NV4500, SM465, or 700R4?

Discussion in '1982-Present GM Diesel' started by arveetek, Apr 11, 2002.

  1. arveetek

    arveetek 1/2 ton status

    Mar 1, 2002
    Likes Received:
    Granby, MIssouri, USA
    I thought I would ask this question here first for all you diesel gurus!

    The 465 tranny in my '86 K-10 is making some awful noises, and I need to do something about it. I have 31" tires and 3.73 gears, so it winds up the motor quite a bit running down the highway. This truck sees little off-roading, so I'm looking for more streetable use here. My other truck is an automatic, so I'd like to keep this one a manual gear banger.
    My first choice would be to replace it with an NV4500. However, this would be rather expensive. It's hard to find one used, and it's about $1900 for a new/rebuilt one. Plus, it would be rather difficult to install, what with all the bellhousing differences.

    Secondly, I already posses a 700R4 auto out of a 6.2L diesel powered 4WD truck. However, it's an '82 model, and I don't even know if it's any good. I bought a whole engine, tranny, and accessory package off a guy who was parting out a truck. He said it was good, but who really knows? He was going to a gasser, and I mainly bought the stuff for the engine. I'd hate to install it and not have it work. Rebuilding one isn't cheap either. This swap wouldn't be so difficult.

    Thirdly, I could rebuild the 465. I would really, really like to have overdrive. But, this is a good, solid tranny, when it doesn't make noise that is. Rebuilding this one would probably be the cheapest route. And it will scoot down the road at 70 mph, I just hate to hear the motor wrapping up so much.

    Any comments or suggestions?


    AJMBLAZER Better to be lucky than good. Premium Member

    May 18, 2000
    Likes Received:
    Paducah, KY
    What exactly are the bellhousing differences between a SM465 and a NV4500? Just curious.

    I'd say go with a NV4500. Expensive yes, but the OD and low first gear gives you the best of both worlds.
  3. Danno

    Danno 1/2 ton status

    Aug 4, 2001
    Likes Received:
    Rockford, IL
    Yeah, I'd have to agree. If you want OD, and want to stick with a manual, an NV4500 is the best bet. You could always install a doubler after the T-case, but I don't know what's involved with the installation.

    Save up for the NV4500, and hope the SM465 doesn't grenade before you've got the new tranny.

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