Most gearboxes in the W50-W55 series are between 20 and 30 years old and all second hand. I fitted my 1st W55 from a 3TGTE in 1984, so many have high K's from 140,000 upwards, so mate sorry but you can't add anything to it to fix it,, Its worn and you will have to pull it apart and fix it. or get another one.
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