November 1, 2011
The jacking points on a Mustang, if you are using the factory scissor jack, are the drip rails of the body. Remember, you have no `frame`. Instead, the outside edge of the body is reinforced in 4 places, marked with notches where the jack can sit. On each side, one reinforced area is just behind the front wheel, and just in front of the back wheel. The `rail` is the straight bit of the body that points straight down - it starts at the bottom of the front fenders, runs along under the doors (bottom of the rocker panels), and then to the front part of the rear quarter panel - under the `C` scoop area of the quarter.
If you have some kind of floor jack you don`t want to jack from these points, because you`ll crush the downward pointing edge of the drip rails.
Instead, if you have a floor jack, you probably want to put a big piece of 2x6 on it to spread the load, and jack from the 4 ends of the subframes (which can also be crushed - they are not real frames!). The subframes look like traditional frame rails under the car but they end just under the driver and passenger`s feet (front subframes) and near the forward ends of the rear leaf springs (rear subframes). Beware - they can be rusty on an old Mustang, and to fragile to lift from.
If your Mustang has aftermarket subframe connectors welded between the the front and rear subframe stubs, you can definitely lift from those - they are MUCH stronger than the actual subframes, which are only made of thin sheets of metal welded together.
Other lifting points - if you are using a floor jack, you can put it under the front cross-member on a Classic Mustang - it`s a steel tube under the oil pan - can`t miss it. Or, in the rear you can jack up under the rear differential (cast iron - strong), or under axle tubes on either side of the differential.
Whichever one(s) you use, put a jack stand under another of these points nearby.
Changing your oil you don`t actually need a jack. You can probably just lie under the car near the front driver side wheel and read the FL-1A oil filter and the (single) drain plug on the pan. Or you could drive that tire up on a piece of wood, a small car ramp, or even a curb.
`79-`95 V8 owners beware - you have TWO oil drain plugs! One in front of the steering and one behind. Front one only lets out about 1 quart of oil.
Good luck! And remember, almost all Mustangs use 5 qt of 10W-30 for oil. Modular motors (after `96) use 5W-30 or 5W-20.