Catfish Pond Driveline Assembly, size 4. Driveline minimum C-to-C is 40" (1010 mm), maximum C-to-C length is 62" (1580 mm), total collapsed length is 48" (1230 mm). Tractor ends: 1-3/8" 6 Spline and implement ends are 1-1/2" round bore with 3/8" keyway. Driveline rated as category 3 (35 hp).