I'm full time in this thing In-Tech, it sucks to have my house break down on me, but I'm doing the snowbird thing so at least I'm in good weather.
Yes I do have internet (most of the time) I've had to learn to adapt on that like everyone else who does this. It's workable.
Updates since I've posted last - the DRAC module I ordered was a kerfuffle, seller sent the wrong part so I couldn't compare it to the one I had. He does have the correct unit and he's a good guy so if do end up needing the part I'll know where to get it.
I've also had a chance to open up the rest of the wiring harness and can say it's been thoroughly checked out and I haven't found any damage, some discrepancies compared to the schematics but I'm sure that's due to manufacturing changes that GM made during production, and it has been working fine up 'till it didn't.
Long & short is that I'll be putting it in a trans shop ASAP and getting the 4L80 rebuilt.
It's still going into limp mode, even though it's running better - and I don't want to drive 1200 miles back to home base in 2nd gear.
What really bugs me about the whole thing is that when It throws the MIL and goes into limp mode I get a no com with the ECU, can't read a darn thing, no codes or data all.
That and it doesn't store any codes either. This is consistent with both PCM's that I've had in it over the last six weeks and I have no idea why.
I get an MIL and the PCM totally sh*t's the bed. It's frustrating at levels I probably shouldn't try to describe, but you get the picture.
Other symptoms that lead me to suspect the trans are my speedometer needle is now pulsing at low speeds. I don't remember that from any time in the previous five years I've owned this thing.
In looking through some 4L80E rebuild videos I've seen rebuilders point out weak sprag clutches and torque converters along with everything else a manufacturer does to make their stuff just good enough to get through warranty, so my best guess is a failed rear sprag and a cracked drum that may have deformed the output tone ring.
This rig weighs in at a lithe 6 tons and it's got 125k miles so I'm probably due anyway.
I'll put that all on red and take it with me to the transmission shop casino.
'Cause baby needs a new pair of shoes!