Rj Link designed a custom gearbox for a centrifugal pump application.  Some of the features include a fabricated steel housing, various input and output shaft configurations, bell housing with clutch, rubber block drive or flange connections. 

Specifications:

Ratio:  1:1   to  1:3.25

Max HP:  650

Input Speed (rpm):  1,200

Overall Size:  34 x 36 x 34 (Depth Varies)

For a similar design mounted vertically, see Model D253