okay im going to try to explain this. i have a 81 CJ7 i took the AMC rear end out of it and upgraded it with a Dana 44 POSI one piece axles. i am trying to figure out what Detroit Locker to get. on the pinion gear its stamped 41/11 so it has 3.73 gears and other numbers as well. stamped after one of the sets of numbers is a 71. so i am guessing it is out of a 71 maybe? is it a 19 or 30 spline. i t