Thread: Allison 6sp: Lbz 2wd to 4wd questions!
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Old 09-09-2019, 03:20 PM
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2004LB7 2004LB7 is offline
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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
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