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Thread: Which are the best and/or worst Duramax years?

  1. #1
    Senior Member 6 Nebraska IDIs's Avatar
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    May 2007
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    Default Which are the best and/or worst Duramax years?

    I've read a couple years ago that a few years of the duramax production were prone to being problematic. IIRC those years are 01, 02, 03 & 04 but correct me if I'm wrong. A friend at work is looking to buy a duramax and I just want to steer him clear of any of the years that are prone to having problems.

    I think he's looking at an '02 right now. Which IIRC is the worst of all 4 or the problematic years.
    Starting with first owned.
    1983 F250 Custom, 4x4, T-19, 6.9, 3.73 light rear. (grandpas truck) -Given to my Brother
    1990 F250 XLT Lariat, 4x4, ZF5, 7.3, 4.10 heavy rear. -Dads old truck
    1994 F350 XLT Crew Cab, 4x4, ZF5, 7.3 factory turbo (now 6.9), 4.10 heavy rear. -Moms
    1994 F350 XLT Crew Cab, 4x4, E4OD, 7.3 factory turbo, 4.10 heavy rear (limited slip). -Dads new truck
    1983 F250 Explorer, 4x2, NP-435, 6.9, ?.?? heavy rear. -My daily driver
    1983 F250 XL, 4x4, ZF5, 6.9, Moose Pump, ARP Studs, 088 ATS Turbo, 2g Dodge Cummins Intercooler, 4.10 heavy rear (limited slip) from 1978 F250, 4.10 Dana 60 front axle, 84,000 original miles on truck; Converted 2wd suspension to 4wd Dana 60. -My "Brown truck"
    1994 F250 XLT, 4x4, ZF5, 7.3 factory turbo, 4.10 heavy rear. -Brothers new truck
    2006 Jetta GLS TDI, Package 1, FWD, 5spd. -Brothers new car (I know its a different breed but its still an oil burner.)

  2. #2
    Senior Member
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    01-02 had injector issues, which still to this day are issues even after "redesigns"

    04.5-07s are generally the most favored models. IIRC its the 04-05's that have some issues with overheating on heavy loads. 06+ they have the 6 speed Allison

    I had an 2010 that was a total POS. I got rid of it with about 7k miles on the clock. New Turbo, New EGR, bunch of new electronics, and DPF replaced (all warranty of course, but still..) ALso the sheet metal on the new ones is paperthin
    1994 F350 crew 4x4 SRW Its not exactly stock anymore

    Seeking the simpler/less complicated life each day!

  3. #3
    Full Access Member mark7.3idi's Avatar
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    Dec 2008
    wauseon oh
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    01-04 the lb7 r about the best they do have injector problems but u can fix that with good 10% ones now if u go newer they r better to a point like the lbz have head gasket problems the lmm is a goog motor just have to much egr bull crap it is just one of those thing picky things
    01 lb7 234000 runs like new bully dog power pup

    03 chevy 2500hd 6.0

    96 chevy 2500 5.9 nv4500 puling truck

  4. #4
    Site Sponsor MJ Synthetics's Avatar
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    Mar 2009
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    The very best years to own are the 06-07 LBZ (Classic Body). The 07.5 is the new LMM new body style and has the DPF on it which robs fuel mileage. The LBZ has the most hp and torque only a catalytic converter in thye exhaust system that is easily done away with. The least problems are with the LBZ models. The known issues are leaky transmission cooler lines in colder weather but we sell a kit to fix that for good. The 06 and above have the 6 speed Allison Trans which is the best towing transmission on the market.
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  5. #5
    Fiberglass Whore 91idi's Avatar
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    Nov 2009
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    Have 01-07 all are great trucksn
    91 F-250 7.3 5 speed 4X4
    86 F-250 6.9 4 speed 4X4 hypermax cowl intake, stans headers, banks power pack, typ4 cam, ported and polished, Carter P4070
    93 F-350 6.9(from an 83) 4 speed 4x4

    Now taking classes with the guidance of the great Dr. Butts!(thanks Ron! )

  6. #6
    Full Access Member superduty12v's Avatar
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    01-04.5 lb7 had injector issues, alot were replaced under warranty put the warranty to 200k. 04.5-07 lly had restrictive turbo mouthpieces, like to blow HG's and 06-07.5 were lbz's and lly's the only difference was the tune between the two, LBZ is the absolute best motor, just didnt have mahle pistons like the true LLY's and LBZ's, cant really handle above 550-600hp. the LML and LMM have DPF and DEF, dont know much else about em. handle horsepower well. i love my dmax, dont give me a problem.
    01 2500hd 6.6 duramax, straight piped, mbrp flat black tip, 6"fabtech lift, 35x12.50 nitto terra grappler MT's, 5% tints, UWS black box.

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