This is the original rear end out of my 1969 Mach. It was rebuilt by a friend in 2002. Comes with 31 spline axles, 3.70 Auburn Pro differential, backing plates and spring/shock plates. The spring perches are a bit beat up and should probably be replaced. It should be cracked open and inspected as it was making a strange intermittent sound going down the road. My gut says its not a serious issue. Tag was gone when I bought the car in 1986, it was originally 28 spline 3.00 open per Marti. Prefer pickup in 03249 but would consider shipping it.