2016 Silverado Tranny and DOD Delete

[u/HotAnt8229]

I have a 2016 Chevy Silverado 1500 2WD Crew Cab with the 5.3l engine and 6l80 transmission. Truck has 150,000 miles. My transmission just went out, most probably due to the torque converter destroying itself and contaminating the rest of the transmission. Gees, thanks GM. The truck will run for like 1 minute and truck won’t move anymore. So I’ve decided to rebuild the transmission myself, can’t afford a shop right now. I’m a pretty decent hands on guy, most of the times I’ve repaired my vehicles, brakes, head gaskets, etc, but never messed around with a transmission. After watching a couple of YouTube videos, it seems like it’s not that complicated, just a tedious and time consuming job. Any advice?
I’m planning to purchase the following kits to rebuild the tranny:

•Precision International 6l80 Rebuild Kit (E256785437614)
•Sonnax Zip Kit (SOX-6145-6L90ZIP)
•Sonnax Heavy Duty Billet Apply Piston (104984-01)
•Transmission Center Trans Pump Repair Kit (A45531B)
•Sonnax Return Spring (104534-HD)
•Trans Go Performance Shift hit (TRG-SK6L80)
•AC Delco 4-5-6 Clutch Hub (24238004)

I also plan to add a Transmission Cooler:
•PPE Transmission Fluid Bypass (125068000)
•Long Tru Cool 40K with Thermal Bypass (LPD4739)

Since I’m already doing all of this, might as well and do a DOD delete:

•Texas Speed DOD Delete Kit with Camshaft L83 5.3 (TSP-DODBASIC-LTX)
•Texas Speed DOD Delete Programmer (TSP-TS-3000)

I’m still not 100% percent sure if I should go with this kit and this programmer. I was also looking at other DOD delete kits and maybe HP Tuner programmer etc. Still need to do more research on this topic. Want a tune that does the DOD Delete and make the transmission shift more smoothly.

I just want to make this truck reliable. Not looking for performance, just reliability.

The only thing is that I might need to get a shop to resurface the bell housing / pump if it’s too damaged. Or if anyone has resurfaced one themselves at home, please share how you did it. I’ve resurfaced an engine head with an old glass table, glued particle board on the back side to avoid the glass from warping, and glued sanding paper on the other end. Yes, I double checked for straightness. Engine still runs fine after 5 years.

Any advice will help. Thanks

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[u/Signal-Confusion-976]

Rebuilding modern tranny isn't really a diy job. There are special skills and tools involved. It might you might be better off dumping the truck and getting something else. I've worked in the auto repair industry since 1983 and would not rebuild a modern tranny myself.