There are too many choices. Pull the RPO code from the glove box and you'll know for sure.
As far as what axle to choose, depends on what size tires. Check a gear ratio guide and you'll know for sure.
Ratio Guide
__________________
~Kane
USMC
NRA
GWRRA
AMA
Remember:
Except for Slavery, Fascism, Nazism, Totalitarianism and Theocracies,
WAR HAS NEVER SOLVED ANYTHING!