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JB Conversions' NP231HD is built with every possible strength upgrade including all that is available through the aftermarket and original equipment manufacturer (NVG). They begin with a bare, empty case and fill it with new components, including a genuine Borg-Warner Morse wide chain; wide-tooth main sprocket and front output shaft; 6-pinion planetary gear set; new bearings, seals, small parts, filter pickup, thrust washers, etc.; and a heavy-duty SYE kit with a 32-spline output shaft that makes this the shortest and strongest 231 available today. No front driveshaft modifications are required so the existing front output yoke can be used.