The conductor plate has the speed sensors and connect the solenoids to the harness. When it fails you get limp mode and fault codes.

The adaptations are the learned adjustments to the shift program. Early modules can adapt inappropriately causing shifting problems. If the trans shifts better when the adaptations are zero'd out then there is an updated module that will fix it. Adaptation is cleared using the factory scan tool.

If shifting doesn't improve after resetting the adaptation then there is likely an actual trans problem. Often caused by antifreeze contamination of the ATF from a faulty radiator in early 203 chassis cars like yours. A glycol test can confirm contamination. If positive in any significant concentration then the trans is pretty much shot.

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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