Got them done. Diffs: The USA diff is familiar, the balls click in like they should. After its built, it didnt tighten down as much as I expected. Screw bottomed out, then back 1/8 turn, and it just never dit tighten up then release. It feels good, but wondering if it will loosen noticeably after running. The worlds kit diff slightly diff erent. The balls fall in loosely, no little click. After its built, it did tighten up nicely, then felt perfect when the screw was backed out 1/8 turn.
So, on to the assembly. Both units have a little roughness and will need broke in. Neither too bad in that department.
The worlds car trans went together requiring no re work. No rubbing of the slipper plate.
1st pic the worlds kit top shaft. .518 from the flange of the gear to the edge of the flat.
2nd pic the USA stealth top gear. .492 from the flange of the gear to the edge of the flat. A difference of 26 thousanths, or about 5 sheets of paper,, or a freakin MILE in machinist terms. This is a huge in consistency in the production process,, or possibly a whole different standard dimention???
I had measured the spacers at .345" after removing the molding flash. I had to file them down to .32" to make the slipper plate not rub. So, I took .025 off, almost the same as the difference in the shafts. Makes sense. I also had to file the bolts down so they wouldnt rub the slipper plate.
Last pic the two trans tip to tip of the slipper shafts. You can see on the right side there is about 1 extra thread sticking out from the nut. It had to be tightened down that much more( roughly 25 thousanths again) to get the same "feel" as the worlds kit slipper. Worlds kit on left, USA kit on right.
Another thing noted. The USA top shaft was about .0003 smaller in diameter than the worlds kit top shaft. What this means is it wobbles slightly more in the bearings. Probably a tolerance of +- .0005 on the shaft diameter is acceptable.
I think They are both good. The USA trans required the rework of the spacers, and the shaft is machined a bit off I think. Who knows what their manufacturing tolerances are though. They might be in spec.