Duramax in an old 6x6 in Germany

[GSMIX]

Hello everyone,

I registered because I'm currently working on my Duramax project. I'm rebuilding an old 6x6 truck from the 1960s.

I removed the 5.5L 6-cylinder flat-hat gasoline engine and the manual transmission and spent a long time searching for a good LBZ Duramax with an Allison 6-speed 2WD transmission from a truck. Then things changed. I got a very good deal on a brand new LLY/LBZ Duramax from a Savana. I then bought a rebuilt Allison 1000 transmission from a dealer. The Duramax and Allison transmission are missing the correct wiring harness. Since I don't know anything about Duramax engines, I don't know which truck wiring harnesses I need to buy so that the engine and transmission will work in the end. I know that the ECM and TCM need to be programmed. Can anyone recommend something or tell me what surprises I might encounter with the van engine? I think I can simply swap the Y-bridge for the one from the truck. I'll remove the EGR since I don't need any emissions. Thanks for your advice. I look forward to a professional and friendly exchange.

Sorry for my basic English.

Michael from Germany

 

[TheBac]

Welcome!

Moved your thread into Repower/Transplant section so your questions can get answered.

 

[2004LB7]

Welcome

Does your engine have an FICM? If so, you can use basically any LLY truck harness. If not, then any truck LBZ harness.

What speed Allison did you get? The LLY has a 5 speed and LBZ uses a 6 and they are different TCMs.

Maybe a little more information on what you have

 

[GSMIX]

No I have not the "FICM" from LLY on the front right side of the engine.

I have an 2006 Allison 6-speed transmission. I do not have a TCM.

The engine has a custom-made wiring harness from an abandoned project. It was originally intended for a 4L85E transmission.

The Bosch ECU (LBZ) is programmed with EFI Life. I don't want to use this engine wiring harness. I need a simple harness with only the necessary components.

Can and should I post pictures here?

Best regards, Michael

 

[TheBac]

Fuel Injection Control Module........Its a silver box usually located on the passenger side valve cover.

Yes, post pics.

 

[2004LB7]

If no FICM, then it's an LBZ (depending on year, it might have been called an LLY, but identical to the LBZ other than programming. Which can be fixed)

Just find an LBZ wiring harness from a truck and pull out what you need and rewrap it.

You'll need efi live or HP tuners to turn off all the codes for missing modules like BCM, unless you keep them. Yo can also use it to turn off the security so you can start the engine without the special cylinder and BCM

 

[Nate’s Dmax]

I believe since it was a van engine is why it is coded LLY even tho may have been made in 2007. I know the Kodiak/Topkick were called LLY in the 2007 model year.

 

[MarkBroviak]

I believe since it was a van engine is why it is coded LLY even tho may have been made in 2007. I know the Kodiak/Topkick were called LLY in the 2007 model year.

Correct, vans and Kodiaks were coded lly for several years after the fact. To answer the question, you need to just get yourself a regular pickup truck complete harness and cut it down to fit your needs.

 

[GSMIX]

"According to the ECU, it's an LBZ. The homemade wiring harness isn't compatible with the Allison 1000, but rather with the 4L85E. The harness came from a van, and some connectors are in different positions. I probably need the complete wiring harness from an LBZ truck, ideally in a ready-to-install configuration. I don't have time to build it myself. I still need to finish the entire body and the cargo bed. And converting from a single cab to a double cab isn't something that can be done in a day.

Where can I buy a complete, ready-to-use LBZ wiring harness, along with a flashed ECM and TCM?"

Einige Bilder:

 

[gobig]

No helpful information for you but that is going to be a really cool unit

 

[GSMIX]

Yes, indeed, there hasn't been much helpful information so far. But I'm doing my own research every day and have found several suppliers of standalone wiring harnesses. I need the complete one, including the engine side. I'm just not sure if everything will fit the van's engine. In the end, it will work, but I'm a bit pressed for time.

In the meantime, I've finished designing the belt-driven air compressor for the air brakes and TIFS. Today I continued working on the classic cargo bed.

 

[malibu795]

The 06/07 Chevy Express vans came with LBZ/4L85.
Mechanically it's a derated LBZ from 360hp in the pickup to 250hp for the vans...on paper it's a LLY
The TCM is a T42... The Allison needs a T14/A50

The y bridge and coolant bridge are biggest difference between van and pickup

 

[GSMIX]

Die Chevy Express Transporter der Baujahre 06/07 waren mit LBZ/4L85 ausgestattet.
Mechanisch gesehen ist es ein gedrosselter LBZ, von 360 PS im Pickup auf 250 PS in den Transportern... auf dem Papier ist es ein LLY
Das TCM ist ein T42... Das Allison-Getriebe benötigt ein T14/A50

Die Y-Brücke und die Kühlmittelbrücke sind die größten Unterschiede zwischen Lieferwagen und Pickup.

Bist du sicher? Ich glaube, das passende TCM ist ein A40/T14a für den 2006er LBZ und den GM 2006 ALLISON 1000 6-Gang-Automatik MW7, 2WD.
Prost

Michael

 

[malibu795]

Well it translated my post to your language, but it forgot to translate it back to English

Seeing my post in German is pretty cool though

 

[GSMIX]

The 06/07 Chevy Express vans came with LBZ/4L85.
Mechanically it's a derated LBZ from 360hp in the pickup to 250hp for the vans...on paper it's a LLY
The TCM is a T42... The Allison needs a T14/A50

The y bridge and coolant bridge are biggest difference between van and pickup

Are you sure? I think the matching TCM is an A40/T14a for the 2006 LBZ and the GM 2006 ALLISON 1000 6-speed automatic MW7, 2WD.

Cheers

Michael

To ensure I don't misunderstand anything, I sometimes use the Chrome browser, which automatically translates everything from English into German. The only catch is that it also translates my English replies.
This doesn't happen with Safari.

Cheers
Michael from good old East Germany

 

[malibu795]

Yep lol

And yes I believe you're on the right track.. though I'm sure more smarter people will double check me

 

[Bdsankey]

The Duramax vans did not get the Allison like the pickups did.