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  1. Allison OEM
    Truck will not go into any gear, just thumps really hard and rolls a few inches either direction. Mechanic shows code of P0562, TCM low voltage. I've exhausted all my internet research down to batteries, ignition switch, wiring short between TCM and trans, or TCM failure. I replaced ignition...
  2. Duramax First Generation: 2001-2004 (LB7)
    I just had my 3rd starter in 4 weeks break, wtf? After replacing it the second time I check the bolts for tightness daily and they are tight. I've never seen a starter break off and the part of the housing that is bolted is still attached to motor. Until now that is. And idea why these keep...
  3. Duramax First Generation: 2001-2004 (LB7)
    I am not a mechanic and I am probably way over my head! My son purchased a 2003 LB7 truck with 95,000 original miles. It runs rough at idle and has excessive blow by. The mechanic is recommending a used engine swap with a 176,000 mile LKQ motor instead of fixing this one. His reasoning is...
  4. Duramax First Generation: 2001-2004 (LB7)
    I’m a proud owner of an ‘04 ccsb lb7 with a zf6. My problem is the poor thing needs either a rebuild or new owner. I put 127 miles on it last year, mostly plowing snow. It’s a fairly solid truck with minimal rust and decent interior. It for certain needs head gaskets and injectors. And while I’m...
  5. Duramax First Generation: 2001-2004 (LB7)
    I have read a bunch of no-start posts and am struggling a bit truck ran and started fine then sat for 4 days and would not start fuel 1/2 tank Pressurized tank could not see leak Cranks without problem I primed got air out of bleeder screw, then primed till hard, went to start and lost prime...
  6. Allison OEM
    help my 02 5spd allison will only roll forward a couple feet then stops. Almost like it goes into park . Reverse works fine . Trans went out is when it first started . Still doing it after trans rebuil ?????
    lb7
  7. Duramax First Generation: 2001-2004 (LB7)
    My 01 3500 LB7 will go into limp mode when towing. It has to be sort of a long hill. I need about 10 seconds up hill with at least an empty gooseneck trailer. I did catch a code months back, P0234 overboost. But it rarely throws a code when it goes into limp mode. I finally got a pillar...
  8. Duramax First Generation: 2001-2004 (LB7)
    Have change ny fuel presure regulator on fuel pump and now the engine wont start eny one have a god idea LB7 engine thanks in advance Jorn Hansen
  9. Duramax First Generation: 2001-2004 (LB7)
    Ok guys so i just got this 01 LB7, she’s a 4x4 extended cab truck in great shape. And under 200k miles! My only problem so far is this weird idle surge. Sometimes it happens sometimes it doesn’t, sometimes it’s only in drive at idle and not in park and sometimes the opposite. I replaced the FPR...
  10. Duramax First Generation: 2001-2004 (LB7)
    Can I just change 1 injector by.just pulling upper valve cover? Also wouldn't a balance Rate check show me which body is cracked by a very high balance apart other 7. So pissed off these Bosch remains from Pensacola Diesel and they don't even have 15 to 20k on them and they won't warranty. He...
  11. Duramax First Generation: 2001-2004 (LB7)
    I tried priming with the screw and it didn't help need this truck for work anyway I can get it back soon?
  12. Buying or Selling a Truck Questions
    I’m looking at a 2006 LB7 duramax to throw in my 1958 Apache. The engines $950 cash, what are things I should look for when I go to see it.
  13. Duramax First Generation: 2001-2004 (LB7)
    We have a babied pure stock 2003 2500HD with 84k miles. We are on a year long trip towing our travel trailer. The trailer plus all our gear is approx. 7000 lbs. We have new Bosch injectors, all new filters and all fluids are synthetic. We went over our first small pass and found the truck...
  14. Buying or Selling a Truck Questions
    Hello, ive been working on getting a 3/4 or 1 ton truck for towing for a little bit know and have recently been offered a trade for a LB7 powered 01 2500HD with 190K Miles. Im asking forums for help as im a gas mechanic, never worked with a diesel. Up until know I was just waiting on a good deal...
  15. Duramax First Generation: 2001-2004 (LB7)
    Has anyone had a problem with Dorman's high pressure feed lines? I installed them about 3 years ago on my LB7 as part of an injector job and was pleased with the price and quality. I always use a 19mm flare nut crow's foot to torque them properly. Yesterday while driving, had a strong fuel smell...
  16. Duramax First Generation: 2001-2004 (LB7)
    Ive been working on an 03 LB7 w/140k miles on it. Egr delete and after market oil cooled fleece turbo installed before I got it. Had all the signs of blown head gaskets so tore it apart and replaced them with arp head studs. Had heads resurfaced and replaced all o rings and gaskets associated...
  17. Goliath

    2003 Sierra 2500HD crew cab short box, SA conversion to dana 60, sdp turbo s369sxe, divorce np205, 44’ boggers, 5.13 12bolt, ARB locker (📸2019)
  18. 2004 Sierra 2500HD Duramax

    4x4 crew cab long box (📸2017)
    lb7
  19. 2004 Sierra 2500HD Duramax

    4x4 crew cab long box (📸2007)
    lb7
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