The drive axels can be removed & replaced individually. If you've actually broken the front differential housing you will need to get the gear ratio and find out what kind of diff you have in the truck and make a trip to the wrecking yard and get a used one and replace the diff. as a complete unit.
No.No.
what year interchange with a 2002 dodge ram 1500 front bumber
No
behind the front bumper
that depends on what is wrong with it
In the exhaust, front of catalytic converter.
You can't repair worn out ball joints. Replace them with new ones.
The 1995 wheels will not clear the brakes if you put them on the front of a 2002.
$1500-$2000 to suck it
NoNo
No, it will not.
Purchase a repair manual at most parts stores, ( around $12 ) for detailed instructions on this and many other repairs.