If there is still an AMC 20 in the rear, chances are very good that the stock D30 resides in the front. The D44 was never offered as a stock front axle in a CJ to my knowledge, and most swaps to get a 44 use a Waggy 44 which requires out-boarding the front springs. You can make a D44 with similar axle tube lengths to a D30 but it is a lot of work.
Check for a number casting on the axle web like shown here:
Differential identification charts