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CampingN_C_'s avatar
CampingN_C_
Explorer
Aug 15, 2015

2006 Duramax LLY vs. LBZ

Couple questions,
Other than the 8th vin digit, I've read that the LBZ will have the newer "DuramaxAllison" badge on the side where as the LLY will just say "Duramax. Do you guys agree?
Also, under the hood. What are some things to look for on a used one in the 85-100K mile range? I know absolutely squat about diesels, as opposed to my current 6 liter being possibly one of the easiest engines to work on.
Correct me if I'm wrong. The 06 LLY is just simply a detuned LBZ, same exact engine minus the programing?
Anybody know the HP differences?

35 Replies

  • Look for worn tie rods and slop in the steering. Also a chemist at work has one and had been fighting a CEL problem that I believe required changing out the complete instrument pod on his nickel and we very $$$$. So don't assume a CEL can be a cheap fix on these trucks.

    Good luck...
  • donn0128 wrote:
    If I remember correctly LLY was only 2004 and part of 2005. LBZ came mid year 05.

    Almost...
    LBZ came out mid year 06.
    Before that they were LLY's
  • If I remember correctly LLY was only 2004 and part of 2005. LBZ came mid year 05.
  • For what it's worth I too had the 6.0 and now have the 06 LBZ. Just looked and the badge on mine is Allison Transmission/ DuraMax. I love the truck it has 160,000 and runs great. Two glow plugs and normal maintenance that's it for me. Oh yeah just returned from the UP of Michigan and 12.7 towing hand calculated. Good luck-buy it.
  • Google will send you to the duramax forum. A lot of good info there.

    Look at the exhaust manifolds and look for where someone may have installed EGT probes. If they did I would stay away. Was more than likely tuned and abused by a Bro.

    I am seeing diesels start to come down in price in my area because of the repair costs that come early on in the life of the truck. Just not worth the expense and headache if you don't need one. If pulling 10K plus a week you need it. If only for the occasional tug to the campground you don't.

    Look up prices for injectors, pumps, and tranny rebuilds. If you can't do these repairs yourself, add in labor. Gets expensive quick.