LLY and LBZ

Here is a writeup of the duramax's..
wikipedia

davidbt wrote:
Thanks everyone. going by my Vin. I have a LB7

So you only have to worry about your injectors and the 4500 to change them. Chris

jaycocamprs wrote:

CKNEK wrote:
The confusing part is GM produced two versions of the LLY 04.5 to 05 were the early versions that some people had overheating problems. The 06 late version LLY was basically a detuned LBZ with none of the overheating problems. The early LLYs had the 5 speed trans and the late LLYs had the 6 speed trans with the +/- on the shifter column.

The detuned LBZ engine in a 05-body truck will still overheat. It's not the engine that’s the issue, it's the smaller radiator in the 04/05 trucks.

The LLY in an 05 truck is not a detuned LBZ. Second gen LLY's ONLY came in 06 trucks.

CKNEK wrote:
The confusing part is GM produced two versions of the LLY 04.5 to 05 were the early versions that some people had overheating problems. The 06 late version LLY was basically a detuned LBZ with none of the overheating problems. The early LLYs had the 5 speed trans and the late LLYs had the 6 speed trans with the +/- on the shifter column.

The detuned LBZ engine in a 05-body truck will still overheat. It's not the engine that’s the issue, it's the smaller radiator in the 04/05 trucks.

Thanks everyone. going by my Vin. I have a LB7

The confusing part is GM produced two versions of the LLY 04.5 to 05 were the early versions that some people had overheating problems. The 06 late version LLY was basically a detuned LBZ with none of the overheating problems. The early LLYs had the 5 speed trans and the late LLYs had the 6 speed trans with the +/- on the shifter column.

davidbt wrote:
Been reading a lot of posts, still trying to figure out the difference's between the two engines. I have an 04 2500 D/M LT with 99,600 miles. Bought the truck when it had only 73,000 miles on it.

One overheats and one does not over heat. Chris

LB7 8th character in the VIN is a "1"
LLY 8th character in the VIN is a "2"
LBZ 8th character in the VIN is a "D"

If your truck is an 04, it could be either an LB7 or LLY....it would not be the LBZ.

Thank you