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Part # 915 Instructions
Part # 915 jacking rails are used in conjunction with Part # 912
subframe connectors. Installation requires welding. Recommended process is
either Mig or Tig.
When installing 915 jacking rails, the main subframe 912 should be
tack welded to the car in the front and rear. Do not weld them on yet.
You are going to fit all the tubes (915 kit to the 912 kit) first, tack
weld them together on the car, and then drop the subframe down and weld
it complete before re-installing the assembly on the car.
With the 912-subframe tack welded to the vehicle, position the
1-inch square tube up next to the outer rocker rail seam along the
inside. On some mustangs the factory incorporated angle iron as part of
the outer rail in order to add additional support. The 1-inch diameter
rail will fit perfect inside the support.
The photo above shows how the assembly fits under the car. In
this case the square tube subframe installed directly into the outer
factory rail.
The diagram below shows how the assembly goes together. Take the
square rail and place it up next to the rocker rail seam. The square
tube should run along the rocker rail all the way to the rear
wheelhouse. You may have to remove chalking that is placed along the
floor seam in order to get the rail up tight in the corners. Once you
have the tube fitted clamp the tube to the rocker rail using a couple of
c-clamps. 
You are now going to fit the cross tubes. The cross tubes require
cutting them to length for proper fitment. There are 3 positions where
the cross tubes are installed. The measurements are taken from the very
end of the front of the 912 subframe. The first tube is approximately
14-1/2 inches back from the end. The second tube is approximately 34-1/2
inches back and the third tube is approximately 52 inches back. The
length can change slightly based on clearances. Mark the 912 main tube
at these locations and then take one of the cross tubes supplied in the
915 kit and cut it to fit. The tubes are mitered on one side, which goes
towards the 912. After you have fit the tube, tack weld the tube to the
912 subframe and square tube. Note: the cross tube should be 90 degrees
to the main 912 subframe and the square tube.
Follow the same procedure and fit the other two tubes. Make sure you
have good tack welds. Take a look at your fitment. If the cross tubes
look parallel to each other, weld as much of the cross tubes to the main
912 subframe and outer square rail as you can.
Once welded you are going to break the tack welds holding the 912 to
the car and unclamp the outer rail. Drop the subframe assembly down and
then finish welding the rest of the cross tubes.
The gussets supplied in your kit fit on each side of the cross tube.
They install across from each other on the tube. This means only 2
gussets per cross tube. See diagram above. Weld the gussets supporting
the cross tubes and let the assembly cool.
Paint the top of the subframe that goes next to the floor and let
dry.
Reinstall the subframe on the vehicle lining it up with the prior
tack welds. Clamp back into position and weld the assembly to the floor.
Follow the instructions about welding the 912 to the vehicle. Strip-weld
the outer square rail to the factory support rail or rocker rail
depending on what you have. Strip welding should be weld 2 inches then
skip 2 inches and then weld again. Some times you may have to tap the
factory rocker rail seam over to the square rail. This will make welding
easier.
After the subframe assembly is welded to the vehicle, locate two
small tabs from the 915 kit. These tabs are jack points that need to be
welded to the square outer rail. They locate in the same location as the
factory jack points. Weld then on 90 degrees to the square rail pointing
down. These tabs allow the factory spare tire jack to be reused.
After welding is complete, paint the assembly.
Move to the other side and follow the same procedure.
On Mustang convertibles the factory has installed four panels as
additional floor supports. These supports are pop riveted on. They are
located on the underside of the floor pan, underneath where your feet rest
and in the rear at the lower main bulkhead. These panels provide a small
amount of enhancement to the structure of the vehicle compared to subframe
connectors. Global West subframes require removal of these panels. Simply
unscrew the sheet metal screws and drill out the pop rivets. Take a small
chisel and knock the heads of the rivets. Once the panels are removed the
subframe kit will install.
Another brace that serves little function goes from the lower plates to
the center of the cross member. Unbolt this "support" as it is no longer
used.
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