As it is your front prop that is giving trouble it would not be an improvement to drop the Dana 300 as such. You can turn it and "clock" it but this will cause other issues and reduce clearances.
It is not clear which CJ you have as you have not filled in your profile but I assume it is an early 80s CJ7. The front shaft is, depending on gearbox, around 3-4" LONGER than the rear shaft. It is more common to have problems with the rear shaft when you lift the suspension as the angles will be acuter in the back.
If it was a CJ5 this would be an even truer observation.
So, why are you having problems with the front and not the back? Most users have their CJs in 4WD for only short periods and the shaft should be at rest. Are you only using it off road or are you using it in 4WD on tarmac?
When you say the clip fails do you mean the securing bolts that hold the bearing caps on to the shaft?
If it is your joints breaking or wearing out what grease are you using and howw pumped are they with grease? What brand of joints are you using? Spicer are reckoned to be superior.
I am just surprised you do not have these problems at the rear.
If you want to find out more about angles look up Tom Woods website.
BagusJeep lives in Bali, the Land of Temples.
With a Jeep every prayer counts.
1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1995 Cherokee 4.0 - CHEROKEE