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I can shift though everything and the display will change accordingly, always returning to Park. Even if I view transmission data with the scan tool, it shows accurate changes while I move the lever.

So I ended up ordering a whole new VB and TECHM right from GM, price wasn’t too bad. They came in today so I got the VB together and everything installed in the truck. I used GM Techline Connect again to program the new TECHM. Now, I can’t even get the truck to start. The IMS is showing the...

I’ll send you a message.

I got the old TECHM installed today and it didn’t go super well. It did get to above 80 degrees without losing reverse, so that’s different than the “new” one. However, it immediately threw a CEL and had the following codes: - P0967 CPC Solenoid #2, Circuit Voltage High - P0971 CPC Solenoid #3...

Wait, never mind. I assume the end plugs should be snug in the bore, that’s the whole point of the sealing rings. Nothing would push from the keeper side like I was. Apologies. I think I’m still going to throw the old TECHM back in when I get home and compare pressure readings to your video...

Thank you! I was out this morning making sure that everything was all good with the valve body. Im going to put it back in with the old TECHM, because at least during my first test drive if definitely attempted to shift up into 4th, now I don’t even get a rev like it’s in neutral. However...

Haddam. Almost right in the middle. Are you good with 6L’s?

If it comes to that I’d ideally just like to ship the VB and TECHM. I can’t imagine freight shipping from CT to Texas would be.

I guess I can always try throwing the old TECHM back in and see what happens or if anything changes symptom wise.

I’m really not sure how I could have messed it up. I used a GM MDI and bought access to SPS through Techline Connect. Then I went in and selected TCM and hit program, and it showed that it took the calibration number. Also, even if it didn’t I still couldn’t shift up into 4th with my old...

So I still don’t know what’s going on, but I was lookin at the the 6L80 ATSG solenoid activation chart (the bottom one in the picture) as well as the one in the Sonnax Zip Kit instructions (top in the picture) and going off my assumption that it feels stuck in 3rd when warmed up, I noticed a...

No codes. Quick breakdown, still just rolling on jackstands: Last night -initially had Reverse and could shift through 1,2,3 but nothing would change when I commanded 4. Once the fluid heated up (I got around 90) I lost Reverse and it seemed stuck in one gear (felt like 3rd). Today - again had...

Today’s title - “Should I have bought 2 of everything?”

Update as of tonight. My nightmare continues. Please watch both linked videos and let me know if you have any thoughts or questions. I appreciate all of the help despite my struggle!

Unfortunately not an option. Before I started the rebuild I called every shop around me and none of them do bench work anymore. They all wanted the whole truck, and none of them would even rebuild it. They all wanted me to bring the whole truck, and then they were just going to replace the unit...

I got the unit all back together tonight. I split the VB back apart just to make sure everything was good and the only things that seemed a little off were the two long valves in the end of the VB, clutch selector valves I believe? They aren’t stuck, but they are snug towards the end when they...

Update as of today!

Ok, I’ll try testing without 3/5/R later today. As for the stator support gasket, I took the bolts off, pressed it out, cleaned excess gasket material, installed new gasket, pressed the support back in, and torqued bolts in the sequence. I did just get a new paper gasket, is there a better...

During the second video I was pumping air into the 4/5/6 drum, when it was upside down on the pump, as soon as I released air the clutch pack would just like “die out” and not really hold any pressure whatsoever. Is it possible that just mis-sized teflon rings could cause such a bad leak? Or is...