weak reverse gear on 1991 Toyota Previa

Car worked perfect in Houston. It has automatic transmission. Towed it to Pittsburgh in neutral last December. when it got to Pittsburgh, it did not want to go into reverse. could "fiddle" it to go into reverse, however, reverse is very weak. all fwd. gears work and are strong. Fluid is full. Checked housing along the way, warm, not hot.

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1 answer
I suppose check to see the shift linkage is OK and fully engages reverse after that this is a simple automatic transmission, the problem is most likely inertial in the transmission.