Well, after J. Roncallo shipped me his collection of shims I went ahead and bolted the ring gear to the carrier. With it installed the closest shim combinations were tried. As luck would have it, my closest combinations were either too loose or too tight. 1.8 and .95 mm shim combo doesn't quite hit the spread spec and ends up .21 backlash. Next closest is 1.45 and 1.3mm and they end up in the negative backlash range and pretty much bind the assembly. If I could locate a 1.7 to use in place of the 1.8 it likely will be golden. The search is on. There are a couple shops local that may have a pile of old diffs around. Worst case scenario I'll have to get one of the thicker shims ground.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff