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The 1997 has a torque converter drain plug. For 722.6 up to model year 99, there is a spring (Pressure Control Valve Spring) that tends to collapse or break. When that happens, the up-shifts will be rough, especially 2 -> 3 and 3 -> 4. So when you change fluid, definitely check that spring and it only costs $2. See the diagram.
For jcyhun, the design changed but the spring could still experience problem, therefore affecting shifting quality. It is too late to check now because the oil pan has to come off.
I recently had to replace the conductor plate on my 1997 E320 and bought several of these springs just in case when I had the valve body out of the car. Mine did not break but was collapsed.
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