Question: Need duramax suburban transfer case help - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 09-20-2019, 05:25 PM   #1 (permalink)
Mmcclos08
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Need duramax suburban transfer case help

Hi guys, I did a duramax lb7 swap and am having an issue with the transfer case. I am hoping someone out there knows the correct fix. Donor truck was 2002 lb7 5 speed ally with floor shift transfer case, i removed that and attached a used 2003 transfer case NP1 from another lb7 truck. I then put this combo in a 2001 suburban 2500 that had an np8. I put cardone 7342104 tccm in and 3 button switch and a tc shift motor from 02 duramax that has 6 and 2 plug. I removed the orange and tan wires from the 4 pin plug on the suburban so ended up with a 6 and 2 pin plug that matched the shift motor. I am getting c0323 and when i turn the key on the switch flashes in 4hi and i put trans in neutral and it clicks around a few times then all lights on switch go off and it seems to be in 4hi without the front diff lock engaged. (Front and rear driveshafts spin with all wheels off the ground). Is this a wiring issue? Part compatibility issue? Or is the shift sequence on the 03 transfer case different from 02 preventing the simple swap of the shift motors?
Any help is much appreciated!

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Old 10-09-2019, 03:25 PM   #2 (permalink)
Mmcclos08
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to answer this question for future users, the module is in fact different. I cannot find a replacement/reman one anywhere so I got one from the bone yard for $100. It has a green connector instead of orange and you have to cut one tab off of the orange connector in the suburban so it fits the port then everything just plugs in and works. The part number is 15063845

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Old 10-09-2019, 03:47 PM   #3 (permalink)
Kriesel
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Good to know. I didn't know the answer to your original question. Glad you got it fixed up
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'03 Quadrasteer Burb 2500 - 2006 LBZ swap
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Last edited by Kriesel; 10-09-2019 at 03:48 PM.
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