Automatic Transmission Fluid and Filter Replacement. GMC Truck TopKick C-Series (Conventional) C4/C5 2009

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2009 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Transmission 🢒 Automatic Transmission - Allison 🢒 Automatic Transmission Fluid and Filter Replacement

Note: DO NOT drain the fluid if only the control main filter is being replaced.

Remove drain plug (6) and drain plug seal (5). Drain the transmission fluid into a suitable container.

Note: Use a standard strap-type filter wrench to remove the control main filter.

Remove the filter (4) by rotating it in the counterclockwise direction.
Remove the magnet (2) from the filter attachment tube (1) in the converter housing or from the top of the control main filter (3).
Clean any metal debris from the magnet. Presence of any metal pieces larger than dust may indicate that transmission replacement or overhaul is required.

Reinstall the magnet (2) onto the filter attachment tube (1) which is in the converter housing.
Lubricate the gasket (3) on the control main filter with transmission fluid.
Install, by hand, the control main filter (4) until the gasket on the control main filter touches the converter housing.

Caution: Turning the control-main filter more than ONE FULL TURN after gasket contact will damage the filter and may cause fluid leakage.

Caution: Refer to Fastener Caution in the Preface section.

Tighten
Tighten the drain plug to 35 N·m (26 lb ft).

Refill Transmission with DEXRON®III Automatic Transmission Fluid or Allison TransSynd™ Full Synthetic Fluid. Refer to Fluid Capacity Specifications.

Note: DTC P0701 may often set following fluid service. Cycling the ignition clears the code and allows Drive or Reverse range to be attained.

Note: Fluid remains in the external circuits and transmission cavities after draining the transmission.