I’ve noticed there is a flat spot when shifting from 4th to 5th gear, if I don’t get the shift right it goes in to “neutral ” between gears I guess. The distance seems greater between those two gears. Is this a common issue ?
Not in my experience. That's all I can say.
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My transmission knowledge is about zilch. I know there was/is an issue with the lack of a retaining clip that held 5th gear in position, but I think that showed up in 1986 - on. Somehow, I feel inclined to recommend you contact Ted Porter at The Beemer Shop. He seems very familiar with these gearboxes.
Thanks, appreciate the tip.