Join Date: Feb 2008
Location: From Ohio, live in Havelock, NC
Thanked 40 Times in 32 Posts
Look on the VIN for the 8th digit for engine ID.
1 - LB7 (2001-2004.5)
2 - LLY (2004.5-05)
D - LLY/LBZ [note: The LLY of these years is actually an LBZ with different tuning. So check the build date (IIRC on the drivers door) before you buy. IIRC, the switch was in Jan of 2006.]
6 - LMM
Allison trannys were 5 speeds 2001-2005. 2006-up are 6 speeds with tap shift.
I know this is an old thread, but just wanted to update this.
The 06 LLY still has a 2 in the 8th digit of the vin. Its still the same hard parts as the 06 LBZ with the D in the vin. They both have 6sp allisons as well.
2006 Chevy 2500HD LBZ/Allison ECSB 4x4 Greystone metallic
S475, 3" boost tubes, 5" intake, Custom Y-Bridge
Tuning and Transmission by Diesel Addiction . A special thanks to Dustin for all the help.
12.42 @ 106.3 (stock injectors, CP3, and turbo, no drugs!)
7.83 @ 86.2 1/8th
531 RWHP / 940 RWTQ 10/11/08 on Wayne's Dyno in Jville NC