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fitted tool to check crown wheel and pinion ring gear play , its recommended between 0.06 to 0.14 , I got 0.10 which is nice middle :wink:

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back cover and diff covered in BMW gasket sealant , got them both in one peace and ready to fit back in to the car .

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and my smallest spanner , 50mm :hehe!:
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Diff is back in car , filled oil and did first test drive , lot corners to get LSD unit fully lubricated for perfect performance and main think its longer life . No other tricks needed , so thanks again for Your time reading this short story ,and best of motoring for Peter !