Ok guys I’m back again. Lol. I think I may have finally solved my problem but wanted some advice before I started tearing things apart. So my 99 burb k2500 7.4l with 4l80e trans started losing reverse one day, it was slow to engage, then the next day it was completely gone, no feeling whatsoever of it engaging. Then 4 or 5 days later I went to take a short trip to the auto parts store and it was like my truck was locked in 4wd low and had a very very noticeable delayed shift from 1-2. So I turned right around and parked it and have been researching the cause ever since. That was about a month ago and I think I may have finally found out what the source of my issue is. I’ve been reading a lot about my components and I think it’s the torque converter that is causing my problems. Back in late summer I had an issue with it feeling like I was driving over tiny speed bumps, something I now find out to be converter shudder, something back then I thought to be transfer case issues, I pulled the front drive shaft and my problems seemed to go away, until a few weeks later when reverse started going out. I don’t drive the truck much so maybe that’s why it seemed to take so long for it all to come to this conclusion and for me to put all of the symptoms together but I think that’s what it is. Any and all feedback would be appreciated. Especially so from mr Clinebarger, if he would be so kind as to chime in. Lol. You were a great help to me before thank you. I think my tcase needs a new motor as it still switches from 2wd to 4wd on the switch on its own but I can’t get it to switch from 4wd to 2wd by pressing the button. I can hear it trying to switch, and I can feel it, as it makes the vehicle lurch when doing so but it will not engage 2wd when I press the button. I think it needs a new switch(button) as well as the motor. Hopefully not a new or rebuilt tcase. This 4l80e was bought used and installed by yours truly so I may have screwed up somewhere as it was my first ever tranny swap, sounds like it won’t be the last time I pull a tranny if it is truly the TC acting up. Oh, I replaced solenoid A and B and the fluid was already quite dirty in the pan after less than 5000 miles of use. No metal pieces but quite a bit of “mud”. I cleaned the pan and the magnet and topped it off with Dex VI after replacing the solenoids but no change. That was my first and cheapest repair option and a chance to inspect the valve body and the pan. I didn’t replace the filter because it was new when I installed the trans. Any help? Ideas? Anything besides R&R? I’ve still got the original bad 4l80e that was the reason for all of this starting last winter. If nothing else, I’ll take it to the shop and have it rebuilt to clinebarger specs and reinstall it myself. That should cut the bill in half at least I would guess. Thanks in advance everyone