Slip or Chatter In Manual 1ST Position

SLIP OR CHATTER IN MANUAL 1ST POSITION
1. Improper band/clutch pressure, line pressure high/low.
2. Main control (valve) body:
a. Bolts improperly torqued.
b. Gasket damaged or out of position.
c. Separator plate damaged.
d. Main control body valves or springs damaged or missing
e. Wrong component used in rebuild.
f. Dirty or sticking main control body.
3. Low/Reverse one way clutch damaged.