2005 C6 fitament help needed
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1st Gear
Joined: Apr 2026
Posts: 1
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2005 C6 fitament help needed
Hi New Here I am Mike.....I have a 05 manual conv. I am rebuilding it was a wreck. I bought an engine off ebay LS3 from a 2011 I have the 2011 harness and computer. I just realized so far anyway the brake module is different I have the 05 one If i get one from a 2011 should work correct? harness plug is different. any thing else I may run into?? Also bought a RPM Racing tranny.....but it only has 1 port for rev lights can I splice the lock out/l lights together ? or ill put the lights on a toggle NP. Thanks in advance
Heel & Toe
Joined: Apr 2025
Posts: 20
Likes: 14
From: Idaho
The BCM and rear trans harness you will also need in addition to an updated ABS module, The 05 trans harness will not have a fluid temp pigtail, so assuming you got a TR6060 from RPM you will need an updated trans harness if you want to see the temp.
The BCM and ECM have to be married to each via programmed VIN so if you could get the BCM off of the same car you got the ECM that would be ideal.
The BCM and ECM have to be married to each via programmed VIN so if you could get the BCM off of the same car you got the ECM that would be ideal.
Le Mans Master
Joined: Dec 2004
Posts: 5,493
Likes: 808
From: West coast CA
Hi New Here I am Mike.....I have a 05 manual conv. I am rebuilding it was a wreck. I bought an engine off ebay LS3 from a 2011 I have the 2011 harness and computer. I just realized so far anyway the brake module is different I have the 05 one If i get one from a 2011 should work correct? harness plug is different. any thing else I may run into?? Also bought a RPM Racing tranny.....but it only has 1 port for rev lights can I splice the lock out/l lights together ? or ill put the lights on a toggle NP. Thanks in advance
You will probably have an easier time adapting your existing electronics to the LS3. There are some differences with the throttle and you'll need to re-tune the ECM. Unfortunately your 2005 has the one-year-only E40 ECM which may complicate matters. Search for info about LS3 swaps into early cars for more information about that. Note if you live in California that a tune will change the ECM's CVN code and you won't pass smog inspection.
