A BT DieselWorks exclusive!
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If you have a 2004.5-2005 LLY Duramax, and want to no-fuss easily upgrade to a 2006-2007 LBZ and 6-speed Allison, you are now in luck!
BT DieselWorks has developed a custom adapter harness that easily plugs inline with a factory 2006-2007 LBZ engine harness and 2004-2005 LLY body/dash harness to make installation of an LBZ into your 2004-2005 LLY truck a snap! No cutting, no splicing, no swapping pins around. This harness plugs in under the fuse block, and also includes the wires (with proper pins pre-crimped) to run to the OBD port, and to the shifter, so the LBZ-style "tap-shift" shifter is plug and play with the 2004-2005 truck as well.
NOTE: You will need the following items for the 2004-2005 LLY to LBZ swap, in addition to this adapter harness. You do NOT have to send us the LBZ ECM or TCM. You only need this conversion harness.
LBZ 6-speed Allison transmission
LBZ 6-speed TCM
LBZ "on engine" wiring harness (the harness with the fuel injector connectors on it)
LBZ "underhood" wiring harness (the harness with the LBZ ECM/TCM connectors on it, as well as the long tail that goes down to the transmission)