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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 4L80-E/4L85-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis >> Off-Vehicle Repair Instructions >> Low and Reverse Band Servo Apply Piston Pin Check

Low and Reverse Band Servo Apply Piston Pin Check

Tools Required

    Fig 1: Identifying J 21370-10
    GM31240Courtesy of GENERAL MOTORS CORP.
  1. Install the J 21370-10  into the low and reverse band servo pin bore. See Special Tools .
  2. Position the J 38737  over the low and reverse band servo bore with the hex hub facing the parking pawl linkage. See Special Tools .
    3. NOTE: Refer to Fastener Notice.
  3. Fasten the J 38737  to the case with 2 low and reverse band servo cover bolts (61). See Special Tools .

    Tighten:  Tighten the bolts to 24 N.m (18 lb ft).

  4. Verify that the J 21370-10  moves freely in the J 38737  and in the low and reverse band servo pin bore. See Special Tools .
    5. IMPORTANT: The hex hub of the J 38737  must be tightened in order to determine the correct low and reverse band servo piston pin length. See Special Tools .
  5. Tighten the hex hub of the J 38737  . See Special Tools .

    Tighten:  Tighten the hex hub of the J 38737  to 34 N. See Special Tools .m (25 lb ft).

  6. Observe the lands on the J 21370-10  in order to determine which land is even with the top edge of the J 38737  . See Special Tools . Note the letter (A, B or C) stamped on the J 21370-10  . See Special Tools .
  7. Refer to the Low and Reverse Band Servo Piston Pin Specification table, in Transmission General Specifications , in order to determine the correct pin length to use.
  8. Remove the tools.
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