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Bulk update for the past weeks of "What did I do..." Truck's still apart, coming up on a month now, but it's pretty close to being back together. Maybe all done this weekend. Here's how things were looking... Transmission was nasty. I bought myself a pressure washer at some point and zapped this clean. I can't believe don't have a pic of the cleaned unit with the 4:1 case installed. I did do this, though... Maybe it'll make for a nice junkyard find one day! Cleaned out the underbelly! What a mess. Was loaded with Sedona red clay. You can't see it, but I also sheared a flex plate bolt at the 6 o'clock position. That sucked to extract. I had intentions to replace the RMS, but like many people have discovered, it's not the seal, but the stupid gasket strip of the seal bracket. After reading up on what all it actually entailed, I said screw it. Cleaned up the area and laid down some gasket maker all over it. Should be fine/I'll regret it some other day. I did pull down the lower oil pan to clean up all the oil build-up over the years. Everything's way cleaner now. Once I had the transmission attached, I changed out the motor mounts. Almost didn't because of how terrible access is on the passenger side, but I'm glad I did... Installed a transmission cooler... Ran into a snag with some crappy catalytic converters off ebay last weeked...they absolutely do not fit the truck. After numerous failed fitment attempts, I eventually built a jig with the OE assemblies and fitted the new stuff into the jig to see how bad was and maybe if it could be reworked...nope. It's terribly misaligned, practically every component of it. The amount of incompetency feels deliberate. OE units jigged up: New units on the jigs. Holy gaps/alignment/crap! Since the upper cats weren't marked L/R, I tried every combination and rotation possible. What you see is the "best" combination, and also the only one that was close to being feasible. At this point, I'm just planning to clean up the OE units and put them back on. I'm past the return date, so these are a loss likely. Not even worth the effort to rework; the catalytic honeycombs are probably crap anyway. The OE units are probably still fine, but this main overhaul was just to totally refresh everything, since I kept throwing a P0430 (catalytic converter efficiency) over the years. The upstream O2 sensors were the original sensors, and judging by their condition, it may be the real cause of the code. L to R: LH & RH upstream (both OE), LH & RH downstream (both aftermarket). I don't blame the previous owner for never changing them. They're such a pain. The heat shields alone probably added an hour to the job, because they block the sensor hex. I still need to get the cats and a new exhaust on...hopefully no surprises there. The other day I also realized that t-case shifter arm is different between an R50 and a WD22 Xterra, which is what my donor t-case came from. The Xterra arm is longer, which prevented shifting into 2H. Swapping the arms was a bit of a pain...the pins that hold the arm onto the shaft are wedged in place. Took penetrant, heat, and a hammer and punch to get it out. I was able to get them swapped tonight, so shifting operations are back to normal.