youll need a new pinion crush coller and know a little about preload. I guessed at preload but have built a few dozen rear ends over the years, Im sure there is an inch lb setting for preload but thats also with the ring gear removed so it wouldnt be accurate.
The part about marking the position of the bolt only works if you replace the same flange, with a different flange your outta luck.
Personally I would hold out and find a bolt in option instead of playing russian roulet.
just my 2c
95 E34 530I V2.37
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