04-04-2017
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Member
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Join Date: Aug 2011
Location: Cambridgeshire
Posts: 275
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As a guide I look for a little movement, somewhat like the pinion and spur gear. On our 401 gearboxes I have two shims the gear side and one/none the other, plus one behind the crown gear. That works for us. Check the mesh on yours to see how snug it is and adjust as needed 
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