1995 w 1150 hrs TD 507 reverse reduction gears w standard Twin Disc flange couplings. 1.11:1 ratio Complete package with flanges, heat exchangers, aftercoolers cleaned recently, filters, oil changes. CAT said that the borescope showed cross-hatch on bore tops and bottoms. Updated Cams, Cam advance, inj pumps, injectors and related parts. Recent aftercooler cleaning. All coolers, heat exchangers included that are attached to units. Units sold as complete twin set with gears only, will not separate. They are drop-in units, fully assembled. never in salt water. Will not separate. Price is for the pair.