rear passenger wheel not driving

[rivetapproved240]

alright, heres the jist of it. one night after it rained, was driving took a corner that was 35mph at about 75mph. was distracted by annoying song on the radio. caught the turn which is really sharp. brakes locked up, caught the car before it spun out of control, softly slid onto shoulder (grass & soft dirt) trying to get the car out burried down to axle's. but when i tried to drive it forward i noticed that my passenger rear wheel wasnt spinning like my driver side.. it was moving at all. got pulled out by a redneck with tow straps... good thing about florida, plenty of rednecks with towstraps. took car to self pressure wash.. let cool down, washed undercarrage and inside rims, axles and the whole car. i was wondering why my rear passenger side wheel wasnt spinning. i have less than a week to get it fixed for free (carmax). please help

[NISTECH]

you dont have an lsd rear end. its a 2 pinion rear end. meaning the wheel with the least amount of positive grip is gonna be the one that spins the other wheel is only along for the ride.