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what year diesel to buy?

Discussion in '1982-Present GM Diesel' started by sanddragon2004, May 20, 2003.

  1. sanddragon2004

    sanddragon2004 Registered Member

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    Ok, i have an 89 half ton gas 350 sub, and i am thinking of selling it, and looking for a sub with a diesel engine in it.

    What years are the best? what should i look out for? please help!
     
  2. azblazor

    azblazor 1/2 ton status Premium Member

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    Generally the newer the truck the more refinements that have been done to the drivetrain as far as the 6.2/6.5. If you want the solid front axle go for 89-91 Sub's. If you want IFS then the first year those Sub's got a diesel was 1994 (electronic fuel injection pump) (last year for mechanical fuel injection pumps in GM trucks is 93).

    You may need to be be aware of the GVWR as it relates to emissions testing in your area. In the Phoenix area over 8600 you test the same as a semi. Its very expensive - like $30 a year and its a pain. Lighter duty just get an idle test.

    Also - do you want an overdrive transmission? Only 1/2 tons (700R4 - better after 87) had them until 1991 (3/4 ton - 4L80E).
     
  3. sanddragon2004

    sanddragon2004 Registered Member

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    well i want an 80s sub, prefer 82-91 bodystyle, but my main question is their anything special about the diff year motors? in th3 6.2-6.5? also is the towing capacity near what a 350, or 454 is?
     
  4. azblazor

    azblazor 1/2 ton status Premium Member

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    The 6.2 89 up, or maybe it is the 91 up, somebody will step in here, are the same block as a 6.5, and are considered beefier in the crank webbing, as well as having more material around the cylinders.

    I have a 6.2 NA with 4.56 gears and 31's. It way out-tows any stock 350 I have driven. I have a 6.5TD but have not towed anything with it yet.
     
  5. u2slow

    u2slow 1/2 ton status

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    [ QUOTE ]
    The 6.2 89 up, or maybe it is the 91 up, somebody will step in here, are the same block as a 6.5, and are considered beefier in the crank webbing, as well as having more material around the cylinders.

    [/ QUOTE ]

    I think it boils down to the "599" casting number - they should be a one-piece rear main seal as well. Still not sure on exact year though.

    Are you looking for 2wd or 4wd? 89-91 models have the stronger NP241 t-case and 30-spline 10-bolt rear (in 1/2-tons). 90-91 have 30-spline front axles. On the 2wd, there are really only cosmetic differences.

    3/4-tons diesels usually have the 4.10 gearing and TH400 trans - great for towing, but not the best for a daily-driver. The 1/2-ton makes a better DD with 3.08-3.73 gearing and TH700 OD trans. In case you're wondering... GM didn't make a Burb with diesel and manual trans /forums/images/graemlins/frown.gif

    FWIW, I despise 1/2-ton running gear, so I re-geared my 3/4-ton diesel Burb to 3.21 /forums/images/graemlins/thumb.gif
     

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