OEM GMC Sierra 3500 Classic Neutral Safety Switch

GMC Sierra 3500 Classic Neutral Safety Switch Parts and Q&A

• Clutch Switch
  15027967
  Q: How to service and repair the Neutral Safety Switch on an Allison Automatic Transmission on GMC Sierra 3500 Classic?

  A:

  The first step for transmission position switch/sensor and allison automatic transmission repair requires control valve assembly removal from the transmission housing. A t27 torx(R) bit should be used for detent lever/ims retaining bolt removal yet this bolt needs replacement because of its thread-applied patch lock material. The transmission case surface that surrounds the spherical pin requires special care to remain free of marks because an unmarred surface forms the essential seal between the control valve assembly and transmission case. You need to avoid twisting the spherical pin because doing so can result in transmission case harm. Caretakers should apply a protective plate against the spherical pin before extracting it from the transmission casing. Pass the manual shift shaft through the detent lever/ims assembly and the manual shift shaft seal before rotating the detent lever/ims assembly to disengage the park pawl apply assembly for removal of the assembly. To install put the new detent lever/ims assembly into the transmission case and align it with the park pawl apply assembly then insert the manual shift shaft through the manual shift shaft seal and the detent lever/ims assembly . Slip the manual shift shaft into its set position inside the transmission case before adding a spherical pin to maintain the manual shift shaft in position. Insert the detent lever/ims retaining bolt using a t27 torx(R) bit and secure it at 10 n.m (92 lb in). The completion of fastlearn under a scan tool helps update tcm adaptive values for new components which prevents slow adaptive mode and ensures proper adaptive value convergence.
• Neutral Safety Switch
  24221125
  Q: How to replace the Neutral Safety Switch on the 4L60-E/4L65-E/4L70-E automatic transmission on GMC Sierra 3500 Classic?

  A:

  The first step to change the park/neutral position switch for 4l60-e/4l65-e/4l70-e automatic transmissions requires users to engage the parking brake and set the transmission to neutral. Drivers with 4-wheel drive vehicles must remove the front propeller shaft before proceeding. Begin by raising and properly supporting the vehicle then remove the park/neutral position (PNP) switch electrical connector. Start by removing the manual shaft lever nut before taking out the transmission control lever from the manual shaft. Next, remove the pnp switch bolts and take off the pnp switch from the manual shaft; use a file to smooth the edge of the manual shaft because if the pnp switch does not easily slide off. Put the pnp switch in position on the manual shaft's flat sections and push it until the mounting bracket touches the transmission bosses. A new pnp switch includes a built-in positive assurance bracket so the park neutral switch aligner (J 41364-A) becomes redundant during installation. Attach the park neutral switch aligner (J 41364-A) to the pnp switch after installing its bolts hand-tight. The adapter should sit on the pnp switch while the two slots on the tool should match the lower tabs on it. Secure the two bolts with torque at 25 n.m (18 lb ft) while rotating the tool until its upper locator pin matches the slot on the switch top. Take out both the park neutral switch aligner j 41364-a and the positive assurance bracket if present. Crank the transmission control lever onto the manual shaft by installing its nut to a torque of 25 n.m (18 lb ft). Next, reconnect the pnp switch electrical connector. If the vehicle has 4wd, reinstall the front propeller shaft, lower the vehicle, and check the switch for proper operation, ensuring the engine starts only in the park (P) or neutral (N) positions; the switch warrants replacement in cases where it fails to function properly.