Oh for those connecting the dots: the pull out is occasional, from body flex etc but the slamming from one tooth to the next will quickly wear down the edges of the splines and it will happen more often until it's always.

People have had minor success with guibo washers but it's a minor band-aid you are just punting. I think something in the design of the TC to shaft interface is holding the shaft out of the TC (or you could just say stack two guibo and get an extra 20-30mm insertion.

I've never taken out the drive shaft: does the center bearing have axial loading on the bearing? That could easily be what holds the axle from going in far enough.

In any event were it my car I would probably remove the shaft after making some reference marks, determine what holds the shaft back.

Once I found that part, out comes my two favorite tools: band saw and right angle grinder.

Remove the interference holding the shaft from going in. Push it in a proper 20-30mm and make up the length difference on the guibo side. (engineering some nice strong offsets like we use to offset wheels). Maybe bump up the bolts a mm to make up for the added length.

I'm sure the guibo side ALSO has spline connector. What are the chances that can be backed off, a spacer put in in the center to get you an extra 10mm?

You can drill new holes to move the center support.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)