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-   -   Allison 6sp: Lbz 2wd to 4wd questions! (https://www.duramaxdiesels.com/forum/showthread.php?t=83131)

Trip450 09-09-2019 09:36 AM

Lbz 2wd to 4wd questions!
 
Whatís up everyone. So my truck is a lbz 2wd. So Iím going to be purchasing the wfo sas kit. But wonít be for probably another few months. But I have a few questions. I have bought trans tcase body harness and dash harness off a 4wd. My question is if I put everything on my truck will I still be able to drive it in 2wd with the 4wd transmission and tcase on the truck with the 2wd ecm and tcm? Just want to make sure my truck will still be driveable haha

Trip450 09-09-2019 10:11 AM

Lbz 2wd to 4wd conversion ecm questions
 
Whatís up everyone. So my truck is a lbz 2wd. So Iím going to be purchasing the wfo sas kit. But wonít be for probably another few months. But I have a few questions. I have bought trans tcase body harness and dash harness off a 4wd. My question is if I put everything on my truck will I still be able to drive it in 2wd with the 4wd transmission and tcase on the truck with the 2wd ecm and tcm? Just want to make sure my truck will still be driveable haha

Bdsankey 09-09-2019 10:17 AM

Stick with one post asking the same questions. This is the third post I've seen on this topic. One in introductions, one in tuning/logging/gauges, and this one in builds. Making the post in multiple locations will not get you an answer quicker. Your other post in tuning/logging/gauges should get you the answers you're looking for in regards to potential issues via the ECM/TCM/BCM.

PureHybrid 09-09-2019 11:39 AM

ECM calibration stays the same

Trip450 09-09-2019 12:28 PM

Thank you. What about the tcm I don’t want to use 4wd yet

JoshH 09-09-2019 01:06 PM

Stop spamming the forum with the same question. I caught one and deleted it before anyone commented.

2004LB7 09-09-2019 01:53 PM

The only thing I remember about some others who have done it is having trouble in 4Lo. Something about wheel speed being sensed by the ABS being different then what the computers think it should be. Unless you have a way to tell it it is in 4lo. Otherwise in 2hi or 4hi it was fine

Bdsankey 09-09-2019 01:58 PM

Quote:

Originally Posted by 2004LB7 (Post 1139352)
The only thing I remember about some others who have done it is having trouble in 4Lo. Something about wheel speed being sensed by the ABS being different then what the computers think it should be. Unless you have a way to tell it it is in 4lo. Otherwise in 2hi or 4hi it was fine

Would an OS change fix that? I've never tried converting them over either from 2wd or from ifs to sas.

2004LB7 09-09-2019 03:20 PM

I think it was from being unable to send the 4lo signal down the can bus or whatever it used to tell the modules it was in 4lo. Unless you hooked up all of the components, switches, modules, etc 4lo was pretty much a no go unless you are fine running with ABS and other lights on

I think all the BCM, TCM and anything else involved is programmed with the 4WD calibration. It just never goes into it without all the required hardware

There are others here that understand this part much better than me. We should wait for them to chime in

PureHybrid 09-10-2019 06:46 AM

Not sure if 06+ is different, but when I 4wd swapped mine, I just hooked up the harness. Didn't have to reflash anything, just had to source the TCCM and hook it up. From what I remember, Ben said the calibrations are the same, you just have to run a signal wire for 4LO so the ECM / TCM knows


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