TM 9-2520-246-34 Figure 4-27. Sprag Equipped Transfer Model T-136-21 — Rear View. (3) Reverse. When the transmission is shifted into reverse, the reverse-shaft linkage automatically shifts from one sprag unit to the second sprag unit and power is delivered to both front and rear axles. 4-20. Data. National stock no. . . . . . . . . . . . . . . 2520-00-001-7855 Make . . . . . . . . . . . . . . Rockwell-Standard-Timken Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T-136-21 Ratios to front axle: Low . . . . . . . . . . . . . . . . . . . . . . . . . . . 2:137 to 1.000 High . . . . . . . . . . . . . . . . . . . . . . . . . . 1.078 to 1.000 Ratios to rear axle: Low . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.980 to 1.000 High . . . . . . . . . . . . . . . . . . . . . . . . . . 1.000 to 1.000 Gear type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Helical Companion flange splines (all shafts): Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 in. Full depth of splines . . . . . . . . . . . . . . . . . . . . 2 in. Number of splines . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Lubricant capacity . . . . . . . . . . . . . . . . . . . . . . . 7 qt 4-20