Today I did a couple long overdue things: I cleaned the inside and fixed 4lo.
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It still cleans up alright for a 300,000 mile truck. Took a couple good hours though, I vacuumed and shampooed most of it. Good for another year or 2! I really don't remember the last time I vacuumed, likely last year. Still way less nasty than the plow truck was when I got it. Next was 4lo, I was gonna do it the hard way starting over with a custom operating system and then dragging over all the engine and transmission stuff because supposedly 4lo is buried in the system segment. Then I had an epiphany: why not just segment swap the system segment into my tune from a 4wd GMT800? So I did that and it worked! Why TF didn't I do this 10 years ago?! Last year I just plugged the t-case VSS to the rear trans sensor as this trans started life as a 2wd unit so had the correct reluctor in there for it. Plow truck and dually don't have that, this was a proof of concept to get them 4lo. Truck now shifts normally in 4lo AND the speedo reads correctly. That was the one thing I was missing by plugging the rear VSS into the trans. So now the plow truck 411 swap can proceed and I'll be doing some monkeying around with the dually tune now too. It's going to migrate over to the same OS as the blue truck, this is a better OS anyway.
@BNielsen @Mangonesailor and anyone else 4wd with a 411, if your 4lo doesn't work right this is the way. But I think I seem to recall HPT has the 4lo tables unlocked in their software?
