The Allison HT 750 Transmission WITH DEEP REDUCTION DRIVE (DRD) is a versatile piece of equipment offering both automatic hydraulic 5 speed fwd and 1 reverse as well as an manual hydraulic power shift system allowing you to shift gears on demand. This transmission is purpose built with Dual Mode application for road and work mode (specifically in oil and gas applications where safety requires the automatic over the road and power shift is reserved for working over a well where shifting in between gears on demand is required). These units are built out of high grade aluminum main housings, and utilize the Allison 400 series converter providing a range of stall to torque ratios. The most importantly sought after feature on this transmission is the Deep Reduction Drive (what does DRD stand for, Deep Reduction Drive). See the attached spec sheet on this transmission to identify features and specifications. The Wet model listed indicates that this transmission can run PTO’s off of the converter housing. Not all transmissions have this feature. HT 750 DRD are a staple point in the oil and gas industry for well service pumps, mud pumps, workover rigs, pulling units. We can provide; outright, exchange in addition to repair and return service.