Last week i busted my cherry  disassembling  a jag unit I got, it was from a late  xjs like the first one I got--except,  not checking the tag FIRST,  this one was a 2.88--89 last yr of the inboard brakes,  it must have been an eastern car- those damn  wheel hub bearing nuts gave me hell!  The yard guys Also gave me hell,  I go in and tell the counter guy - a few days earlier  the sunday guys said  -a complete jag rear end assembly was ..$..  oh well never nind, anyway first the fork lift driver gave me hell because the car was  buried  in some stacks-only took him 3 minutes to get the others moved.  I drop the unit and take it up to the counter  and he starts claiming im scammin them  "you said differential-the pumpkin"  -"No I said jag rear end assembly".  he ends up charging me $25 more and keeps saying  i pulled $hit--practicing deception , yadda yadda, The guy is from Germany--and is supposed to know euro cars-not just vw's and old smokin benz diesels...
 anyway i went home and  next day took it apart.  

 So  a couple days later  I emptied out my tool box  of all those annoying  mm this and that--How refreshing,  

And go off Huntin Tail.

  I went to the pick and pull on loop 12 in Dallas,  I had spied a V12  earlier when I saw  the other  xjs,   Pick n pulls are the worst place  to get stuff because they charge for every little piece the can to make sure you go home with empty pockets.  this unit I  dropped and then in the uncomforts of the yard  disassembled-- I once again didnt check the tag..............  this one was an 84,  the center was a dana  2.87.  I took the center and the hubs/axles up front and got the $ shock and left the hubs and axles there.
  Breaking down  two assemblies  in a couple days left me feeling worked---  -Like A Rented Mule!

 Its kinda laughable that the jag lovers site says the dana is "widely considered inferior" to their bootleg version. Well maybe over there,  but here-  if you get a dogleg / open salsbury,  or just want to change out,  annd install a auburn unit, You have to find a competent shop to first drill out the 7/16 holes  to 3/8  like the dana.  This is no big deal for me-I got a guy who will do it for a case of Miller beer.  Now if I could just find a differential shop that will set up the pinion shaft preload  for a ridiculously low price...............