That's interesting, I haven't slid the 3.54 Starion CW onto the LOM83 center yet, but it certainly looks the same size and bolt pattern as the 4.22 CW that came off it. I did compare the pinion center heights between the two, and they're the same. The pinion's themselves also look identical (apart from the number of teeth of course). The swap is done the other direction in the Starion world where they want the 4.2 or 4.6 gears for better acceleration, so I figured it would work in this direction also, where I want lower revs on the highway.

Possibly the confusion comes in from the fact that Starions came with two different sizes of diff's in the rear. My 1982 Jap Import Starion has an LSD fitted (factory option), but its the smaller 7.5" version.

I'll hopefully get this swap done in the next could of weeks, so I'll let you know!