[Fot] AN hardware and halfshafts

[Scott Janzen]

My GT 6, with a welded diff, has the halfshaft u-joints bolted to it  
with AN6 hardware.  I was checking out various things under the car  
two events ago and noticed that all of the bolts/nyloc nuts were about  
1/8-1/4 turn loose.  I tightened them up, but after the next event  
they were about one flat loose again.  There's no way to get a torque  
wrench at these, given the proximity to the diff and the u joint on  
the other end of the bolts, so I just give them a good yank with hand  
wrenches.

Question - are these stretching, working loose (with nyloc), or are  
the AN washers, which I find to be fairly soft, compressing?  I really  
lean on the wrenches, so I am amazed the nuts are loosening.  I know  
the welded diff puts a lot of stress on the system, but none of the  
hardware on the outer u joints or the drive shaft, all of which have  
smaller hardware, is loosening, and the events I'm talking about are  
only hillclimbs - not a lot of driving time at all.