Od Case & Drum Support: Disassembly
- Match mark OD case to drum support. Remove bolts retaining drum support to OD case. Remove drum support from OD case. Using a punch, remove OD cancel valve roll pin. Tap pin out from side opposite contacting face. Remove OD cancel valve and spring. On N4A-HL transmission, ensure cancel valve spring free length is .906" (23.00 mm).
- On all transmissions, remove accumulator snap ring. Apply compressed air to oil passage and remove accumulator plug, piston and pring. See Figure . Ensure accumulator spring free length is about 1.560" (39.70 mm) on N4A-HL and 1.590" (40.40 mm) on N4A-EL.