The 44's with 19 splines were around only before the mid 1970's and you probably wont come across one. The D30 is a great axle if it is used for the correct application. A 29 spline chromoly upgrade with a selectable locker will work if you dont use tons of right foot. The key is always to go "a fast as necessary and as slow as possile."

My current project is a 94 XJ and have no plans to toss the D30. Now the Chryslter 8.25...well ill just have to see about that one!!!

Tim

PS- The calmini SAS is specifically designed for a certain axle....the engineers did the work for you already!