Sorry to hear of all your issues with your rebuild. Did you ever get it back together and running?

I didn't like the gear ratios in my R151F after doing a 3.4 swap so I swapped in a gear set from and R150F from a 3.0 powered truck. So you have that option if you were unable to get the parts you needed.

Unfortunately not, the drama continues. The original 5th selector doesn't work with the new set up, so I've ordered a new selector and selector shaft which I received a few days ago. I'm still waiting on another short shift rod as the whole set up changes. I'm hoping I'll get away with just these parts, though I did a quick test fit of the new selector fork and I'm not sure if it's going to fit with the original shift rods, as the part the gear shifter goes into looks like it ends up in the wrong spot.

It's going behind a 1KZ so the gearing should be ok, but I may have to buy another box and do this all again if I can't get it to work.