Suggested replacement: Transmission for Snow-Ex: D6107, D6107-06, D610706, D6106, 83722 Kit, 75901. Snowex Tailgate salt spreader Motor with transmission kit.  
 
Notes: This is the complete motor and gear box combo that fits:
Snow-Ex SP575, SP1075x, Helixx stainless steel hopper spreaders 
 
SNOW-EX SALT SPREADER SP8000, SNOW-EX SALT SPREADER Helixx Stainless steel Hopper
Specifications:
Motor & Gearbox Combo
VOLTAGE: 12V
BI-ROTATIONAL
Gear Ratio: 8:1