AleksS30 Posted February 4, 2013 Share Posted February 4, 2013 I recently swapped in a 3.90 R200 into my 240z and to my surprise it was very smooth and quiet. I did notice the pinion seal leaking quite badly so I decided to replace it. I searched and read multiple posts regarding the pinion nut torque because I was nervous about the bearing preload. I decided to follow the fsm and torque it to 140ft/lbs. Before I took the nut off I marked the nut and the pinion shaft so I can use that as reference when I re-install the nut. I torqued the nut to 140ft/lbs and noticed that the mark i put on the nut was about a 1/4 turn past the mark on the pinion shaft (1/4 turn tighter than it was originally). Now the issue I have is that I'm getting a humming sound from the rear end. It sounds just like a bad wheel bearing. I'm assuming this has to do something with the pinion nut being a 1/4 turn too tight? My understanding it that these diff's do not use a crush sleeve to set pinion preload? I'm not too sure what to do from here...replace pinion bearings? any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
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