1977 auto.,   are all 6 ujoints the same part #? Ecklers and Yogis have me confused. That aint hard.

No, different for halfshafts.  It IS confusing, tho. Looks like 77 driveshaft u joints are the same as 80-82 half shaft u joints. All my books show different for 71-79.mkapp78792007-04-26 10:28:08

Don't be suprised if there are differences at each end of your drive shaft.  Mine was different, apparently they had changed out the rear end to an '82. 

I had to take mine to driveline specialists here to get a new tail shaft after the ones I got from Auto Zone sheared at the rear end.  Had to have the shaft rebalanced and had u-joints pressed in for both ends.  I haven't tried the half shafts yet.