GM 29539579
Filter

The first step in replacing automatic transmission fluid and filter for a 4l80-e/4l85-e consists of vehicle elevation and support along with placing a drain pan underneath the transmission oil pan. Pull out the transmission oil pan Drain Plug which might be present before the complete drainage of fluid takes place. Use gm p/n 12346004 sealant (Canadian P/N 10953480) on the Drain Plug threads when equipped and tighten it to 18 nm (13 ft. Lbs.). Install a transmission jack for supporting the transmission while continuing with the mechanic procedure. Begin by removing the transmission mount nuts followed by the support bolts and nuts together with the side bracket bolts along with the bracket. Use a wrench to disconnect the range selector cable end from the transmission range selector lever ball stud while keeping the selector cable secured to its bracket and then remove the transmission range selector cable bracket bolts and bracket. After removing the oil pan bolts you should note that the transmission Oil Pan Gasket can be re-used but inspect it for damage; if needed replace it before taking off the oil pan and gasket. First remove the magnet from the bottom of the pan before removing the Oil Filter with its filter neck seal. Clean all transmission case and Oil Pan Gasket surfaces with solvent. Install the filter neck seal first followed by the Oil Filter then apply the Oil Pan Gasket to the pan. First install the magnet to the bottom of the pan if needed before you fit the oil pan and its bolts which should be tightened to 24 nm (18 ft. Lbs.). Start by positioning the bracket with cable before installing the transmission range selector cable bracket and its bolts onto the transmission block. Secure all selector bracket bolts at 25 nm (18 ft. Lbs.) and connect the range selector cable end to the transmission range selector lever ball stud. Begin by installing the transmission support along with its side bracket and bolts before securing these bolts with 95 nm (70 ft. Lbs.) torque setting while the transmission mount bolts require 40 nm (30 ft. Lbs.). After removing the transmission jack users must lower the vehicle before adding dexron(r) vi transmission fluid to required levels.

Support the transmission with a transmission jack and remove the transmission mount nuts, support bolts and nuts, and side bracket bolts and bracket.

DEXRON(R)VI Automatic Transmission Fluid.

Disconnect the range selector cable end from the transmission range selector lever ball stud, ensuring the selector cable remains attached to the bracket.

Inspect the drained fluid.