The Nissan truck guys like their lightweight flywheels(basically a 350z flywheel) because it replaces a 3 piece heavy flywheel that tends to fall apart over time to a 1 piece that weighs less makes the engine spin free-er.
I am unaware of any lightweight options for a Ranger. Can you link us? They do offer some advantages to a light truck.
'01 XLT disguised as a '03 Fx4 Level II.