remote or rod that is the question, but I have done quite a few rod shifts and found a successful way of stopping the rattle and made them smooth to operate and reducing the amount of travel of the gear stick.
Similar to what you had done except the bushes are made from acetal plastic and when the case is line bored I also bore the bit where the rubber boot fit so it takes 2 back to back seals.
Get rid of the plastic ball on the stick as when the gear stick travels in a arc it's lowest piont is in neutral and when in gear it is out of the base of the aluminium block. Rattle time
I replace this with a plain spherical bearing in a new alloy block and the gear stick slides in the bore of the bearing and had constant location in all positions.
The other thing is to replace the spring and circlip on the stick so it has more pressure on the top cup/ball arrangement.
Then seal the base plate and half fill it with oil, smooth as silk to operate.
Another trick is to ditch the so called coupling and fit a small uni joint. That coupling allows the whole shaft to rattle as well
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