OEM 2003 Chevrolet Trailblazer Automatic Transmission Filter

2003 Chevrolet Trailblazer Automatic Transmission Filter Parts and Q&A

• Q: How to Replace the Automatic Transmission Filter and Fluid on 2003 Chevrolet Trailblazer?

  A: The replacement process of automatic transmission fluid and filter begins by lifting and supporting the vehicle while placing a drain pan underneath the transmission Oil Pan. By removing the transmission Oil Pan Drain Plug you can proceed with lowering the pan if needed but only without breaking the connection between cable and bracket. Start by removing the Oil Pan bolts from the front and sides only before loosening the rear bolts by 4 turns. A rubber mallet can help open the Oil Pan while drain liquid so you can proceed to remove all bolts to extract the pan system with its attached gasket. Firmly twist the filter to detach it while discarding the filter seal using pliers if needed to remove the seal from the pump. Check the fluid color combined with examination of the filter for clutch material presence along with detector of bushing wear through bronze slivers or identification of steel particles. You must use solvent to completely clean the surfaces of transmission case and Oil Pan gasket while removing all previous gasket material. The transmission filter seal should receive automatic transmission fluid application before you put it into the transmission case by using a suitable size socket to guide it. The new filter needs installation after which you should put in the Oil Pan alongside a new gasket. Tighten the transmission case to Oil Pan bolts evenly and alternately to reach 11 nm (97 inch lbs.) after reinstalling the range selector cable bracket with its bolts secured at 25 nm (18 ft. Lbs.). User should apply gm p/n 12346004 sealant on the Oil Pan Drain Plug threads when equipped before installing and tightening the plug to 18 nm torque (13 ft. Lbs.). Lower the vehicle and fill the transmission using dexron(R)iii transmission fluid until you reach the specified cold fluid mark while searching for any signs of gasket leakage from the Oil Pan.