I did find this info...
PRODUCT / ................................................. FT.LB. TORQUE/.... % TWIST
Yukon 4340 Dana 60 35 spline short side axle.........12,000 ..................130
Stock Dana 60 35 spline short side axle .................6,500 ....................35
Yukon 4340 Dana 44 30 spline short side axle ..........5,800 ...................35
Stock dana 44 30 spline........................................5,00 0.....................35
Yukon 4340 Birfield Eliminator kit (ear failure)............5,500......................50
Longfield 4340 30 spline (shaft failure)......................8,500............... ......175
Longfield 4340 27 spline........................................6,50 0.....................75
Stock Toyota Birfield.......................................... ..4,200 .....................45
Stock Toyota Inner Axle.......................................5,000 .....................45
All Pro "Profield".................................... .... .......... 3,500 ....................30