04-05 LLY to 06-07 LBZ harness FAQ's


2004.5-2005 LLY to 2006-2007 LBZ conversion harness frequently asked questions


1. What harnesses and computers do I have to send?

---You only have to send in the LBZ ECM.


2. Can I use the tap-shift and LBZ instrument cluster?

---Yes, you can swap in an LBZ instrument cluster and have functional tap-shift and "M" mode display. The LBZ instrument cluster is plug and play into an 03-05 truck, however keep in mind your odometer mileage will NOT transfer over. To transfer the mileage over to the LBZ cluster, you will have to have the LBZ cluster reprogrammed. If you do not care about losing the "M" tap-shift display, you can just keep your 03-05 stock cluster. Tap-shift will still work properly, you just wont have the "6-5-4-3-2-1" display in the driver info center when in "M" mode.


3. Can I keep my 5-speed transmission?

---Unfortunately no. You must also swap to a 6-speed Allison when doing the swap. The 5-speed transmission is not compatible with the 6-speed LBZ TCM, and the 5-speed TCM is not compatible with the LBZ ECM.


4. Can I use a variable vane turbo with this conversion harness/swap?

---Yes! The swap fully supports variable vane turbos. You do not have to use a VVT if you do not want to though.


5. Can I use EFILive DSP-5 tuning with this conversion harness/swap?

---Yes! Contact us for details regarding custom DSP-5 tuning.


6. Is it easy to install this conversion harness?

---Yes! The install is plug-and-play. You will also have to run several wires through the firewall and into the cab to the OBD port for the GMLAN data bus circuit. The proper pins are pre-crimped onto the wires, so all you have to do is insert the pins into the OBD port. No splicing, no crimping, etc.


7. What parts do I need to complete the 2004.5-2005 LLY to 2006-2007 LBZ swap?

---LBZ ECM---LBZ fuel injectors/fuel system/fuel pipes---LBZ 58x tooth crankshaft reluctor wheel---LBZ heads---LBZ on engine harness (the harness with the fuel injector connectors)---LBZ underhood harness (the harness with the LBZ ECM/TCM connectors on it). You can also just swap in a complete LBZ engine if you wish.

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