What Is The Difference Of The Lbz And Lmm

[tazenman]

Hello,

 

First off thanks to the creators of this site! TONS of great information!

 

 

I recently purchased a 2007 2500HD and would like to know what are the differences of the LBZ and LMM diesel engins. Also if someone could provide a build sheet for me, my VIN is 1GCHK23D47F103310.

 

 

I also have an issue with the speedometer not being correct. When I purchased the truck it had bald 285 75/r16 on it and the fist thing I did is purchase new tires for it. The tire shop just replaced with same size and off I go. Got a ticket and this is how I found out the speedometer was off. Took it to the dealer and they fixed it, or say they did. I was able to get out of first ticket and received another one just a few days ago. Took it back to the dealer and they said it was still off but that was as close as they could get it. Not sure if I will get out of second ticket or not yet but I will try.

 

Is there any way to fix the speedometer? I have sent Black Bear an email but he only tunes gas engins. He has refered me to Duramaxtunner.com, but have not heard from them yet and expect a response from them today or tomorrow. Why can the dealer not fix this but other "tuners" can? I am a little baffled about this.

 

Thanks a bunch!!

[Stevens03]

Hello,

 

First off thanks to the creators of this site! TONS of great information!

 

 

I recently purchased a 2007 2500HD and would like to know what are the differences of the LBZ and LMM diesel engins. Also if someone could provide a build sheet for me, my VIN is 1GCHK23D47F103310.

 

 

I also have an issue with the speedometer not being correct. When I purchased the truck it had bald 285 75/r16 on it and the fist thing I did is purchase new tires for it. The tire shop just replaced with same size and off I go. Got a ticket and this is how I found out the speedometer was off. Took it to the dealer and they fixed it, or say they did. I was able to get out of first ticket and received another one just a few days ago. Took it back to the dealer and they said it was still off but that was as close as they could get it. Not sure if I will get out of second ticket or not yet but I will try.

 

Is there any way to fix the speedometer? I have sent Black Bear an email but he only tunes gas engins. He has refered me to Duramaxtunner.com, but have not heard from them yet and expect a response from them today or tomorrow. Why can the dealer not fix this but other "tuners" can? I am a little baffled about this.

 

Thanks a bunch!!

 

The reason your speedo if off is because most likely your truck came with 245's and your currently running 285's. The tires are near 3" bigger than stock and throwing the speedo off by more than 5 mph. Another words, if your speedo says your doing 60, your actually doing 65mph. The speedo is controlled by the PCM and was never corrected. Because it's not a "stock" tire size, GM won't fix it. Any hand held tuner or Custom tuner can fix it. Once fixed, it will correct the speedo and the shift points as well since they are off some too due to the larger tires.

[tazenman]

Steven11,

 

Thanks for the fast reply! Yes I knew the different tire size was throwing off the Speedometer, but I just did not realize the tires and speedometer were not in sync when I purchased the truck. I really was not sure what the stock size was until now and I was wondering about the shift point too. Thanks for the great info! It just kind of ticks me off the dealer says oh yes we can fix it, takes my money, and then it really was not fixed. Based on my GPS it is 4 mph off, but it is kind of hard to watch the road, my GPS, and the speedometer all at the same time!

 

So I will wait to hear from the Duramaxtunner.com person and get a tune while I am at it! (Awesome justification to the wife to get a tune!!)

 

 

Anyone else on the other questions posted and a build sheet? I would love to get detailed info on this truck!

 

 

Thanks again!

[ChevyTech77]

The LMM has a DPF system on it, the LBZ does not. That is the main differences. It is possible, with certain aftermarket programmers and other equipment, to remove the DPF system from an LMM and essentially turn it back to an LBZ. I've done it for a friend of mine and while it does make a difference, I don't think it was worth the money (over $2000 after programmer and exhaust mods).

 

GM can fix it but because this truck was never tested and rated for 285 tires, they do not offer programming to install that tire on that vehicle. Read : legal issues. It is, what it is, period.

 

The dealer cannot program your truck for that size tire so they can never make the speedo 100% accurate. The closest they can get is a 265/70R17 which is still more than 1" smaller in diameter than what you're currently running.

 

Bulid sheet/RPO Code list:

 

1SZ - PREFERRED EQUIPMENT SAVINGS 2LT - LT2 DECOR INCLUDES: * DUAL PWR HEATED OSRV MIRRORS * AUTOMATIC AIR CONDITIONING * TINTED GLASS * POWER DRIVER SEAT * FRONT FOG LAMPS * AM/FM STEREO W/ CD PLAYER & BOSE SPEAKER SYSTEM * REDUNDANT RADIO CONTROLS * POWER LOCKS & WINDOWS * REMOTE KEYLESS ENTRY WITH CONTENT THEFT ALARM * ISRV MIRROR W/COMPASS & TEMP * LEATHER WRAPPED STEERING WHL * ELECTRIC SHIFT TRANSFER CASE 69D - DARK CHARCOAL 69I - DK PEWTER INTERIOR TRIM 6GL - FRONT SPRING 74U - VICTORY RED 7GL - FRONT SPRING A31 - POWER WINDOWS A95 - BUCKET SEATING AG1 - SIX-WAY POWER DRIVER SEAT AJ1 - TINTED GLASS AM7 - FOLDING REAR SEAT AU0 - KEYLESS REMOTE DOOR LOCK AU3 - POWER DOOR LOCK SYSTEM B30 - CARPETING, COLOR-KEYED B32 - FRONT COLOR-KEYED FLOOR MATS B33 - REAR COLOR KEYED FLOOR MATS B71 - WHEEL FLARES B85 - BODY SIDE MOLDING C49 - ELECTRIC REAR WINDOW DEFOGGER C6W - GVW RATING - 9,200 LBS CJ2 - AIR COND., DUAL ZONE AUTOMATIC CMD - ASSEMBLY PLANT - FLINT, MI D07 - CUSTOM FRONT FLOOR CONSOLE DF5 - ISRV MIRROR W/COMPASS & TEMP DK7 - INTERIOR CUSTOM ROOF CONSOLE W/ MAP LIGHTS DL8 - DUAL PWR HEATED OSRV MIRRORS DT4 - ASHTRAY MUFFIN E63 - FLEETSIDE BODY FE9 - 50-STATE EMISSIONS FT2 - ARM TORS BAR SPRING ADJ FT3 - ARM TORS BAR SPRING ADJ G80 - LOCKING REAR DIFFERENTIAL GT4 - REAR AXLE, 3.73 RATIO HVY - IDEN 2 INCH BODY RAISE,HD MODEL JH6 - 4 WHEEL POWER DISC BRAKES, HD K05 - ENGINE BLOCK HEATER K34 - CRUISE CONTROL K47 - HIGH CAPACITY AIR CLEANER KC4 - ENGINE OIL COOLING SYSTEM KG3 - 145 AMP ALTERNATOR KNP - HD AUX TRANS. COOLING SYS KUP - THROTTLE CONTROL ELECTRONIC LBZ - DURAMAX DIESEL 6.6L V8 TURBO 360 HP, 650 LBS/FT TORQUE MW7 - ALLISON 6 SPD AUTOMATIC TRANS NP1 - ELECTRONIC SHIFT TRANSFER CASE NP5 - LEATHER WRAPPED STEERING WHEEL NT9 - EMISSION SYSTEM FEDERAL TIER 2 PHASE OUT PDB - ONSTAR PLUS PACKAGE: * ONSTAR SERVICE: INCLUDES 1 YEAR SAFE & SOUND PLAN * XM SATELLITE RADIO - SERVICE FEE EXTRA. 1ST 3 MONTHS INCL. PDN - HEAVY DUTY POWER PACKAGE: DURAMAX DIESEL 6.6L V8 TURBO 360 HP, 650 LB - FT TORQUE ALLISON 6 SPD AUTOMATIC TRANS LOCKING DIFFERENTIAL-REAR AXLE PY0 - POLISHED ALUMINUM WHEELS QIW - LT245/75R16/E OOR BW TIRES R6K - TURN BY TURN - NOT USED R6P - PREMIUM PAINT R8C - ******************************* *** 2007 CLASSIC SILVERADO **** ******************************* R9N - LEATHER SEAT TRIM R9U - GM ACCESS - AUTOBOOK IDENTIFIER R9Z - POMS EXPEDITE-SOLD ORDERS SLM - STOCK ORDERS T96 - FOG LAMPS TQ3 - BATTERY 770 CCA (DUAL) TR3 - CHROME GRILLE U2K - XM SATELLITE RADIO - SERVICE FEE EXTRA. 1ST 3 MONTHS INCL. UB0 - AM/FM STEREO W/CD PLAYER (REPLACES STD/OPT RADIO) UE1 - ONSTAR SERVICE: INCLUDES 1 YEAR SAFE & SOUND PLAN UK3 - REDUNDANT RADIO CONTROLS UK6 - REAR SEAT AUDIO CONTROLS UQ7 - BOSE SPEAKER SYSTEM V73 - STATEMENT OF VEHICLE CERT.-U.S. /CANADA VB3 - CHROME REAR BUMPER VG3 - CHROME FRONT BUMPER VR4 - WEIGHT DISTRIB. PLATFORM HITCH VXS - COMPLETE VEHICLE LABEL X88 - CHEVROLET CONVERSION XGK - LT245/75R16/E OOR BW TIRES-FRNT YD3 - BASE AXLE YD5 - BASE FRONT SPRING YD6 - BASE REAR SPRING YE9 - SILVERADO YGK - LT245/75R16/E OOR BW TIRES-REAR Z82 - HD TRAILERING EQUIPMENT Z85 - HANDLING/TRAILERING SUSPENSION ZHH - LT245/75R16/E ALS BW SPARE TIRE ZY1 - SOLID PAINT