The front axle joints can be transmitting or there is another issue with the diff or t-case, if the rzeppa is moving fine then i'd leave it.
If you really want to change it which i don't recommend since the rzeppa isn't a bad thing.
See your local driveline shop if you need or think you need a new rzeppa head or you want to change to the u-joint cv head, i'd leave it as is and let your local driveline shop have a look at it, but i think you may have a issue and the front shaft may be the link transmitting it.
Seeing your local driveline shop will save you from having to but the entire shaft or a new shaft
. You have the rzeppa at the diff and the cv head at the t-case ?
1995 Jeep gc ltd, 2005 Jeep gc ltd , 71 Dart, 73 RR 440-6pk, 85 Power Ram W-350, 92 Daytona, 99 Dakota, 08 Ram 2500
Less than 8 is like playing with half a deck
Long Island Motorsports Association