My own Transmission engages a little hashly in Reverse. If I had a Band Adjustmet screw I would try that.

However, what I really should do is check the Pump Pressure and then Check the Modulator pressure to see if they are within specs.
If the Modulator Pressure is off I should reset that and then see what happens with reverse.

If none of that helps then if I had the Band Adjustment screw then would be the time to try that.

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84 300D, 82 Volvo 244Gl Diesel