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Discussion Starter #1
The entire time I owned my LLY I loved it, but I would always hear that the LBZ was so much faster and better on fuel with the six speed. I bought an LBZ next and it was no faster and no better on fuel economy. Now I have an LMM and love it as much as the LLY, but the fuel economy still isn’t as good as the LLY (3mpg less). I just wanted to express my opinion
 

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Good to hear patrick. I bought my 04.5 LLY at a decent price because it was "just a LLY and not a LBZ" so that's one more good thing about the LBZ,,, its popularity helps keep price of our LLY trucks more affordable. LoL
 

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Nothing wrong with an LLY. Mine is used mostly to tow our 5th wheel for over 10 years now. Never had any issues other than the usual water pump, front wheel bearings and fixing the injector harness/connectors. Beefed up the trans, just because.... When I got it, first thing I did was the turbo inlet mod and DIY cold air intake. 5 speed is all that's needed for towing anyway... No DEF, no DPF, no CP4, no problem!!
 

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The biggest difference between the 2 was the 5 speed (same ratios as the 6 speed just an extra OD...big whoop), the LLY had an atrocious intake system and the headgaskets will go. LBZ was just the year that they got everything right from the early models, and it didnt have the dpf on it that the lmm got.

Classics just look better then the lmm though so :p
 

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Discussion Starter #5
That’s why I made the post. Everybody says they got it right with the LBZ, but they have their share of issues as well. I never blew a head gasket on the LLY. I had a turbo back exhaust, ppe programmer (that I really hammered on often), and the upgraded turbo inlet. The only issue I had on the LLY was the wiring harness pulling too tight and causing a limp mode. It was an easy fix with a ice pick. LBZ had an issue with the fuel rail relief valve before it hit 100k miles.
 

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LHN...We ARE the Joneses
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Discussion Starter #9
83 at 2100 isn’t that big of a deal. Mine got
great fuel economy at 80 mph and it wasn’t loud. I always thought that extra gear would be amazing until I bought trucks that had it. All of the Duramaxes are awesome, but the LLY is way better than people give it credit.
 

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Its crazy people want $30k for 2007 LBZ with low miles... I have a really nice LLY and actually applied to buy an LBZ guy wouldn't come off $30K but my truck is paid for and couldn't justify selling mine and having $30k payment for 12 year old truck best or not for $10k I put in to my paid off it will spank on almost anything... But the LBZ is awesome just over priced now...
 

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Too bad they didn't put externally accessable injectors on the LB7......
 

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Nothing wrong with an LLY. Mine is used mostly to tow our 5th wheel for over 10 years now. Never had any issues other than the usual water pump, front wheel bearings and fixing the injector harness/connectors. Beefed up the trans, just because.... When I got it, first thing I did was the turbo inlet mod and DIY cold air intake. 5 speed is all that's needed for towing anyway... No DEF, no DPF, no CP4, no problem!!
Hi Ally just wondering if you can expand on the front wheel bearings you mention my LLY is making a slight whinning noise from the front area yet the wheel bearings do not feel really hot to touch
Have replaced the idle rollers
Thanks
 

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Hi Ally just wondering if you can expand on the front wheel bearings you mention my LLY is making a slight whinning noise from the front area yet the wheel bearings do not feel really hot to touch
Have replaced the idle rollers
Thanks
Mine just developed a little slack, about 1/8" or so, right side at about 86K miles, left side at about 115K miles. I don't like changing them on the side of the road when I'm 1,500 miles from home. I shake the front wheels every time I have it up on my lift. Mine never made any whining noises.....
 
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