Duramax Diesels Forum Truck of the Week
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Old 10-30-2010, 04:45 PM
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Default LB7 to LBZ (Wiring)

From what I read, there is not much to it. Please feel free to correct anything I may have wrong below, as this is what I have found so far.

On the C100 connector
Body side "C" (BN) needs moved to "N"
Body side "M" (YE) needs moved to "R"
Body side "G" (TN) needs to be moved to "J"
Add a purple wire to "B" for 6spd tap shift, tap into the pink wire on the steering column
Add a wire to "F" for GM LAN (+)- You'll run this wires to the OBD port "6"
Add a wire to "G" for GM LAN (-)- You'll run this wires to the OBD port "14"
C2(in electrical center AKA under hood fuse block):
Move the Orange wire from F4 to A8
The wire you move on C2 is the TCM power.

On the C2 harness under the fuse box, there are two orange wires that need to be moved to match where they were on the LB7. If not the truck will crank/die about 7-10 times before starting.
The lower rad. hose is diff. LB7/LBZ so I cut the two in the center, inserted a 2" SS tube bead rolled on both ends.
The LBZ Intake Heater grid fuse and fuse holder need to be added to the LB7 as well.
It was a pretty simple swap, and I would do it again over LB7 injectors in the truck anyday, lol. Some more needed PN#s below...

Petal PN#15233970
Petal harness PN#15233968
Shift indexer PN#15866124
Shifter PN#15860125

Small pins Male #15326269/19 Female #12191819/8
Large pins Male #15304731/19 Female #15304719/19


** A 6spd. trans needs to be used, or convert your 5spd. to a 6spd.(TCM, NSBU, Internal harness, Valve body) 6spd tap shifter, 6spd cluster, LBZ throttle petal and petal harness. Am I forgeting anything?









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Last edited by TheBac; 03-11-2017 at 07:20 PM. Reason: Updated and added pics
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Old 10-30-2010, 04:50 PM
DuramaxTireSmoker DuramaxTireSmoker is offline
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Subscribing definitely.. Great info.. ya if i ever buy an lb7 and keep having injector issues i may do something like this!! Thank for the info.
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Old 10-31-2010, 12:19 PM
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Thank you for posting this. Henry recently posted the connector diagrams for the C100 in GMSpecs area, too.
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Old 10-31-2010, 12:33 PM
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is this consistent for 03-04 LB7 or does it include the 01-02 also??? Just wondering.
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Old 10-31-2010, 09:30 PM
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Quote:
Originally Posted by TheBac View Post
Thank you for posting this. Henry recently posted the connector diagrams for the C100 in GMSpecs area, too.
I found his diagrams for the 03 LB7 http://www.duramaxdiesels.com/forum/...highlight=c100 , and asked him two days ago if he could post the LBZ http://www.duramaxdiesels.com/forum/...528#post404528 . If somebody has a minute to verify that the above (post #1) is true and correct, it would be great.
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Old 10-31-2010, 11:00 PM
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Once I get a better Internet connection driving or at a rest stop on this long boring I 70 I will log in to Gm service info and post the 01-03 to see if there the same.
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Old 01-08-2011, 03:38 PM
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The TCM needs to be powered up as well. On the C2 harness under the fuse box, there are two orange wires that need to be moved to match where they were on the LB7. If not the truck will crank/die about 7-10 times before starting. The lower rad. hose is diff. LB7/LBZ so I cut the two in the center, inserted a 2" SS tube bead rolled on both ends. The LBZ Intake Heater grid fuse and fuse holder need to be added to the LB7 as well. It was a pretty simple swap, and I would do it again over LB7 injectors in the truck anyday, lol. Some more needed PN#s below...

Petal PN#15233970
Petal harness PN#15233968
Shift indexer PN#15866124
Shifter PN#15860125
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Last edited by RPM Motorsports; 08-03-2011 at 10:01 PM.
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Old 01-08-2011, 04:51 PM
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Quote:
Originally Posted by RPM Motorsports View Post
The TCM needs to be powered up as well. On the C2 harness under the fuse box, there are two orange wires that need to be moved to match where they were on the LB7. If not the truck will crank/die about 7-10 times before starting. The lower rad. hose is diff. LB7/LBZ so I cut the two in the center, inserted a 2" SS tube bead rolled on both ends. The LBZ Intake Heater grid fuse and fuse holder need to be added to the LB7 as well. It was a pretty simple swap, and I would do it again over LB7 injectors in the truck anyday, lol. Some more needed PN#s below...

Petal PN#15233970
Petal harness PN#15233968
Shift indexer PN#15866124
Shifter PN#15860125
I thought about swapping to lbz stuff this year, but i added it up, and ill probably just keep buying new lb7 injectors. Getting new heads, injectors then sending them to exergy, transmission and some of the other power stuff, injectors will be cheaper. But i will def consider this when i go open driveline. This is a good write up.
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Old 01-09-2011, 12:02 PM
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Russ, is the conversion on an 01-02 LB7 truck or 03-04 LB7 truck???


Thanks for sharing!
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Old 01-10-2011, 04:19 AM
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Quote:
Originally Posted by RPM Motorsports View Post
The TCM needs to be powered up as well. On the C2 harness under the fuse box, there are two orange wires that need to be moved to match where they were on the LB7. If not the truck will crank/die about 7-10 times before starting. The lower rad. hose is diff. LB7/LBZ so I cut the two in the center, inserted a 2" SS tube bead rolled on both ends. The LBZ Intake Heater grid fuse and fuse holder need to be added to the LB7 as well. It was a pretty simple swap, and I would do it again over LB7 injectors in the truck anyday, lol. Some more needed PN#s below...

From GMpartsdirect
Petal PN#15233970 $36.85
Petal harness PN#15233968 $38.84
Shift indexer PN#15860124 $56.80
Shifter PN#15860125
$39.03

Fixed the part # on the indexer for you. Also, I added the prices.
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Old 01-10-2011, 04:24 AM
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Quote:
Originally Posted by SmokeShow View Post
Russ, is the conversion on an 01-02 LB7 truck or 03-04 LB7 truck???


Thanks for sharing!

03-04 LB7. It's to much of a hassle to transplant an LBZ into an 01-02 truck. The computers talk a different speed and language from one another. You'd pretty much have to change every computer, and rewire a ton of stuff to put a 03-07 engine in to a 01-02. That is why most people don't bother with it. Again it's possible, but way to much headache for what is it worth.
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Old 01-10-2011, 04:14 PM
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Quote:
Originally Posted by RPM Motorsports View Post
From what I read, there is not much to it. Please feel free to correct anything I may have wrong below, as this is what I have found so far. What pins are used on the OBD plug for the GM LAN (+)&(-)? I have not looked for that yet.

On the C100 connector
Body side "C" (BN) needs moved to "N"
Body side "M" (YE) needs moved to "R"
Those two do not need to be moved, they are unused
Body side "G" (TN) needs to be moved to "J"
Add a purple wire to "B" for 6spd tap shift
or you can use the gray wire that is already there and tap into it near the guage cluster.

Add a wire to "F" for GM LAN (+)
Add a wire to "G" for GM LAN (-)

Small pins Male #15326269/19 Female #12191819/8
Large pins Male #15304731/19 Female #15304719/19


** A 6spd. trans needs to be used, or convert your 5spd. to a 6spd.(TCM, NSBU, Internal harness, Valve body) 6spd tap shifter, 6spd cluster, LBZ throttle petal and petal harness. Am I forgeting anything?
I did this swap and figured I'd pass this on.
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Old 01-10-2011, 08:56 PM
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Quote:
Originally Posted by chrisuns View Post
03-04 LB7. It's to much of a hassle to transplant an LBZ into an 01-02 truck. The computers talk a different speed and language from one another. You'd pretty much have to change every computer, and rewire a ton of stuff to put a 03-07 engine in to a 01-02. That is why most people don't bother with it. Again it's possible, but way to much headache for what is it worth.
It depends on what your doing with it, full time puller/racer you wouldnt have to mess with most of the headache.
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Old 11-13-2011, 02:28 AM
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Forgot to add a few pics of the project a long time ago.
Attached Images
File Type: jpg pismo 2010 037.jpg (164.3 KB, 235 views)
File Type: jpg pismo 2010 061.jpg (157.7 KB, 250 views)
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Old 11-15-2011, 11:57 AM
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Quote:
Originally Posted by SmokeShow View Post
Russ, is the conversion on an 01-02 LB7 truck or 03-04 LB7 truck???


Thanks for sharing!
the lb7 has totally different wiring and bcm ecms etc... to do that swap you would need the complete wiring out of a 03 up truck along with most of its interior electrics to do that
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