Is it possible that the transfer case is not engaged...that it is between hi and low range or 2 and 4 wheel drive ? Loathe to say in neutral because it not a true neutral.
Try moving the T/C lever through the positions.
The stalling in Reverse is a true conundrum.
A new clutch would not fix that.
Put the transmission in neutral, set the parking brake.
If you get under the Sami, don't touch anything hot.
Try to rotate the driveshafts.(they should rotate freely)
If they turn, try putting the T/C in the settings and turn the driveshafts.
Next put the tranny in any gear and try to rotate the driveshafts.(they should not budge)
Now you know more about the relationships between the T/C and Tranny.
Might help sort the problem.
Welcome to our life/hobby/obsession.
Not knowing what country your are in, cost is impossible to estimate.
Join a club and buddy up with someone to show you how to change a clutch...they are not rocket surgery.