Engine RPO Codes - Chevy and GMC Duramax Diesel Forum
06-07 LBZ & LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
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post #1 of 5 (permalink) Old 01-20-2008, 12:47 AM Thread Starter
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Engine RPO Codes

Thanks to 05_LLY

8th Vin #1-LB7 300 hp
8th Vin #2-04.5-05 LLY 310hp autos only, 300 hp manual trans and 4500/5500
8th Vin #3-06 LLY ratings are the same as vin 2
8th vin #D-LBZ 360 hp auto only, not an option in manual trans or 4500/5500 trucks>
8th Vin #6-LMM 365 hp

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Last edited by ob_1jr; 01-20-2008 at 11:03 PM.
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post #2 of 5 (permalink) Old 04-15-2009, 08:32 PM
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Quote:
Originally Posted by ob_1jr View Post
Thanks to 05_LLY

8th Vin #1-LB7 300 hp
8th Vin #2-04.5-05 LLY 310hp autos only, 300 hp manual trans and 4500/5500
8th Vin #3-06 LLY ratings are the same as vin 2
8th vin #D-LBZ 360 hp auto only, not an option in manual trans or 4500/5500 trucks>
8th Vin #6-LMM 365 hp
I'm not sure if I get this, pardon my ignorance. I'm trying to decipher a vin on a model year 2006 truck.

The 8th digit is a "2" which, if the quote above is correct, would mean that this truck doesn't have the 2006 LLY engine, which 2006 LLY engine is supposed to be closer to the LBZ.

Also this 2006 VIN "2" truck is mated to the manual shift 6 speed Allison, which I have also read indicates that we are talking about a "2006 LLY" which is closer to the LBZ engine.

And if all of this is true, then in the 2006 model year, there were 3 engine options:

- VIN "2" - "LLY" - Like an 04.5 - 05 LLY
- VIN "3" - "06 LLY" - Major changes to the LLY, same internals as the LBZ - better than the VIN "2"
- VIN "D" - 06 "LBZ"

Wikipedia says that the 06 LLY (the LBZ-like LLY) is a VIN 2. More specifically, it seems to contradict the VIN 3 Code above:
"The 2006 LLY (engine code "2") debuted in the beginning of 2006 and ended production with the start of the 2007 calendar year. Mechanically it is identical to the LBZ and is mated to the new 6 speed Allison transmission however it retained the LLY designation. Its output is 310 hp (231 kW) at 3200 rpm and torque is 605 lbft (820 Nm) at 1600 rpm. Huge changes were made for the 06 LLY"
Duramax V8 engine - Wikipedia, the free encyclopedia


Anyhow, I want the LLY that's like the LBZ. The truck I am about to buy has a VIN "2" and the manual shift 6 speed Allison. With all this conflicting information, which engine do you think is in this truck. I've seen 2006 GMC and Chev Diesels with Vin 2, and D. But never a VIN 3.... searched the VIN Check section too. Never a VIN 3.

If the VIN 2 is the 04.5-05 style LLY, then it looks like there were 3engine options in 2006, and all 3 were mated to the 6 speed manual shift Allison.

When I add up three factors:
1. Wikipedia says the 06 LLY has a VIN 2 (never references any VIN 3 as above);

2. Wikipedia and others say the 06 LLY is mated to the 6 speed Allison Auto (manual shift) - which is what the vin 2 truck I'm looking at has;

3. Existence of a VIN 3 would mean there were 3 different engines in model year 2006 - a vin 2, a vin 3 and a vin D. Never heard that there were 3 different engines in MY2006; and

4. Searched the VIN check section and internet, never seen a VIN 3 engine code;
......they all add up to the thought that "VIN 3" quoted above for the 06 LLY (that's mechanically identical to the LBZ) is an error.

I want the 06 LLY because the internals are better and the overheating issues are solved. The mystery is whether there is any such thing as a VIN 3. Any help is appreciated!

Anybody ever seen an '06 with a VIN 3?

Last edited by Jim_in_Calgary; 04-15-2009 at 10:15 PM.
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post #3 of 5 (permalink) Old 04-15-2009, 10:28 PM
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I think I figured this out.

VIN "3" engine code is for the 06 Hummer Alpha with the 06 LLY engine. Had to find this on an oil filter cross reference site. Same site shows only VIN 2 and VIN D for the GMC/Chevy trucks for 2006.
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post #4 of 5 (permalink) Old 04-15-2009, 10:37 PM Thread Starter
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This was just a repost from another member that wasnt a moderator at the time (i think), but you are correct with the information. I looked it up on dieselpowermag.com. But it also looks like you answered your own question...so there is a vin code 3 that is an LLY, just not in a silverado or sierra.

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Extang Blackmax Tonneau
Weathertech floor mats and mud flaps
X-pel clear bra
295/60-20 Toyo Open Country A/T II
Custom EFILive tuning by Kennedy Diesel
Kryponite UCA and Bilstein 5100s

SOLD 2004 GMC Sierra LB7

Last edited by ob_1jr; 04-15-2009 at 10:50 PM.
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post #5 of 5 (permalink) Old 07-10-2014, 08:13 AM
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Quote:
Originally Posted by Jim_in_Calgary View Post
I'm not sure if I get this, pardon my ignorance. I'm trying to decipher a vin on a model year 2006 truck.

The 8th digit is a "2" which, if the quote above is correct, would mean that this truck doesn't have the 2006 LLY engine, which 2006 LLY engine is supposed to be closer to the LBZ.

Also this 2006 VIN "2" truck is mated to the manual shift 6 speed Allison, which I have also read indicates that we are talking about a "2006 LLY" which is closer to the LBZ engine.

And if all of this is true, then in the 2006 model year, there were 3 engine options:

- VIN "2" - "LLY" - Like an 04.5 - 05 LLY
- VIN "3" - "06 LLY" - Major changes to the LLY, same internals as the LBZ - better than the VIN "2"
- VIN "D" - 06 "LBZ"

Wikipedia says that the 06 LLY (the LBZ-like LLY) is a VIN 2. More specifically, it seems to contradict the VIN 3 Code above:
"The 2006 LLY (engine code "2") debuted in the beginning of 2006 and ended production with the start of the 2007 calendar year. Mechanically it is identical to the LBZ and is mated to the new 6 speed Allison transmission however it retained the LLY designation. Its output is 310 hp (231 kW) at 3200 rpm and torque is 605 lbft (820 Nm) at 1600 rpm. Huge changes were made for the 06 LLY"
Duramax V8 engine - Wikipedia, the free encyclopedia


Anyhow, I want the LLY that's like the LBZ. The truck I am about to buy has a VIN "2" and the manual shift 6 speed Allison. With all this conflicting information, which engine do you think is in this truck. I've seen 2006 GMC and Chev Diesels with Vin 2, and D. But never a VIN 3.... searched the VIN Check section too. Never a VIN 3.

If the VIN 2 is the 04.5-05 style LLY, then it looks like there were 3engine options in 2006, and all 3 were mated to the 6 speed manual shift Allison.

When I add up three factors:
1. Wikipedia says the 06 LLY has a VIN 2 (never references any VIN 3 as above);

2. Wikipedia and others say the 06 LLY is mated to the 6 speed Allison Auto (manual shift) - which is what the vin 2 truck I'm looking at has;

3. Existence of a VIN 3 would mean there were 3 different engines in model year 2006 - a vin 2, a vin 3 and a vin D. Never heard that there were 3 different engines in MY2006; and

4. Searched the VIN check section and internet, never seen a VIN 3 engine code;
......they all add up to the thought that "VIN 3" quoted above for the 06 LLY (that's mechanically identical to the LBZ) is an error.

I want the 06 LLY because the internals are better and the overheating issues are solved. The mystery is whether there is any such thing as a VIN 3. Any help is appreciated!

Anybody ever seen an '06 with a VIN 3?
I know, I know, thread from the dead, but at least this is a sticky anyways. I really can't seem to figure out why this is such a mystery to everyone. I'll spell it out in very simple terms. The 06LLY IS NOT and lly (04.5-05) it is the LBZ with a 310hp tune. Every, I meant EVERY part on an 06LLY is identical to an LBZ. In fact, if you have an 06 LLY you can have the dealer upgrade you to the LBZ power level with a flash. Simple as that. Now you may be wondering, "how do I know if I have an 06LLY?" Other than the Vin code you can look at the shifter. If it is a Tap Shift 6 speed, (its NOT a manual shift auto) you have either an 06LLY or an LBZ.

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Last edited by bballer182; 07-19-2014 at 08:56 AM.
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