A mechanic must begin transmission fluid and filter exchange in a 4l80-e transmission by supporting the vehicle then positioning a drain pan under the transmission
Oil Pan. Begin by removing all bolts from the Oil Pan except the ones at the back while loosening these final two bolts by 4 turns to avoid damaging transmission case or Oil Pan sealing surfaces. The customer should first gently open the Oil Pan front to drain the oil before removing all pan bolts and finishing with removal of the Oil Pan itself and gasket and magnet and
Oil Filter and filter neck seal. You can reuse the transmission Oil Pan gasket because it is reusable although you must inspect it before deciding whether to replace it. Drain the transmission case and Oil Pan gasket surfaces using solvent and enable air to dry them completely. Initiate installation by placing the filter neck seal and Oil Filter first and after that attach the Oil Pan gasket to the pan and insert the magnet at its bottom. The installation of the Oil Pan requires the use of all its seventeen bolts, which need to be tightened to 11 nm (97 inch lbs.). You should finish by adding dexron iii automatic transmission fluid and lowering the automobile while checking the Oil Pan gasket for any leaking points.