In a medium bowl, whisk together the sweetened condensed milk, pumpkin, vanilla, spices, and salt until completely combined.
In a large bowl of a standing mixer (or you can use a hand mixer) fitted with a whisk attachment, beat the heavy cream on high until stiff peaks form.
Whisk 1/2 of whipped cream into pumpkin mixture until no streaks remain.
Then, gently fold remaining whipped cream into pumpkin mixture using a spatula, moving your spatula from the bottom of the bowl and folding over the top of the mixture, until all whipped cream is incorporated.
Put half of ice cream into a regular sized loaf pan, and sprinkle with 1/2 of the crushed grahams and 1/2 of the ginger. Put remaining ice cream over the top of that, and finish with another layer of crushed grahams and ginger. Cover pan with aluminum foil (not touching ice cream) and freeze for minimum of 6 hours. Enjoy!