Description 3800 series X – Standard Version C – Internal Ratio – 1 : 0.73 N – Air Shift w/o AK101X Kit 01 – Input Gear / Fuller series (R/675) 1 – Assembly Arrangement / Right, Forward SA – Output SAE “B” 2/4 bolt 13T. Competitive with: Muncie CS8, Chelsea 282 Torque ratings: up to 250 lb. ft