This Fruitland gearbox company model RF500-GB400 gearbox has a 1:1 gear ratio with a single 1.25" input shaft and double 1.25" output shafts. It is specifically designed as a replacement Power Take Off (PTO) gearbox commonly found in oilfiled vacuum trailers. This gearbox includes precision forged fit gears and has press fit tapered roller bearings. Its housing is made of light weight, high thermal capacity aluminum. Every unit is lubricated and run in at the factory. It is lubricated with 28 oz EP80W90.