OK guys; 
  
I have Read this entire thread  ...... sorry if dumb ques ??  I have a couple of Xfer case fluid ques ? 
  
Per the previous posted photo/reply of said FSM says " Xfer case can use ATF  and / or APL GL4 ". 
  
I bought 2 new qts of Valvoline Syn Transfer Case Fluid from Autozone.  Drained black gear oil from Xfer case.  Poured 1 bottle of " Valvoline Syn Xfer Case Fluid " and its was real thin, red, sweet smelling like ATF ...... I said " Whoa !! "  
  
I then drained said 1 quart of Valv Syn Xfer Case Fluid.  
  
I only had APL GL5 for the front diff, so I used the APL GL5 in Xfer Case.  
  
1.  Can I use APL GL5 in Xfer case ?  
2.  Does it have any brass/copper that may get jacked up by the APL GL5 ?  
3.  If so sholuld i redrain Xfer case and place APL GL4 ? 
4.  Does any1 use ATF in their WD21 Xfer case ? 
  
Im 47 and the Ol' school mechanic in me doesnt feel right placing ATF in Xfer case. 
  
btw, i have a stock 91 Pathy SE 4WD, Autobox. 
  
TY, 
Frank