Vintage Stewart Warner performance speed reducer unit in Akron, Ohio For Sale

For sale is a vintage Stewart Warner performance speed reducer unit from an unknown application, these were used in a variety of applications to correct the speedometer readings for low ratio geared drag car rear ends, this unit moves freely as it should, $80 if you can make use of it, I will ship in the US only at buyer's expense, NO credit cards or Pay Pal accepted, thanks for looking!