here is some pictures from all data
1 picture - oil pan
2 picture - oil Baffle Replacement
Oil Pan Replacement:
1 Raise and support the vehicle. Refer to Vehicle Lifting.
2 Remove the 4 splash shield bolts.
3 Remove the splash shield.
4 Drain the engine oil.
5 Disconnect the oil level sensor connector.
6 Remove the oil level sensor wire electrical connector C-clip (1) from the upper oil pan.
7 Remove the lower oil pan bolts.
8 Remove the lower oil pan from the upper oil pan.
9 Pull the oil level sensor electrical connector from the upper oil pan.
10 Remove the oil level sensor bolts (if applicable).
11 Remove the oil level sensor from the oil pan (if applicable).
12 Clean the oil pan.
13 Clean the oil pan gasket surfaces.
1 Install the oil level sensor to the lower oil pan (if applicable).
2 Install the oil level sensor bolts (if applicable). Tighten the oil level sensor bolts until fully seated and not stripped.
3 Install the oil pan gasket.
4 Install a new oil level sensor connector O-ring and lubricate with engine oil.
5 Support the lower oil pan.
6 Install the oil level sensor electrical connector through the upper oil pan and retain with the C-clip (1).
7 Install the lower oil pan to the upper oil pan.
8 Install the lower oil pan bolts. Tighten the oil pan bolts to 8 Nm (71 inch lbs.).
9 Connect the oil level sensor electrical connector.
10 Install the splash shield.
11 Install the 4 splash shield bolts. Tighten the splash shield bolts until fully seated and not stripped.
Do not strip the splash shield bolts.
1 Lower the vehicle.
2 Refill the engine oil. Refer to Capacities -Approximate Fluid.
transmission fluid need to be change 50-60k if u want keep your transmission running smooth and extend life time. but u definitely need to change oil if u get 100k on catera!!! im not recommend to change it by your self, if its reached over 100k!!!!!! that transmission is "sealed" type, its need to be flushed!!! with special machine that shops own. they also will change filter and gaskets. but u be fine if u will do it by your self ONLY if u will get oil from dealer!!! will replace filter and gaskets but between 50-60k ONLY!!!
just like i said !!!! if its reach 100k or over u need to do Flush or u will damage transmission. Also for u to know its not that easy get right level on that type of transmission.
there is two oil pans. one have filter in it, second pan - where all solenoids located and pan have refilling plug. when u take down smaller pan replace filter and gasket, refill with new oil (from dealer) alway up before u screw it back.
second pan, when u drop it down just drain it and replace gasket, then refill until oil will start to come out from plug. screw plug back, drive for a few miles until oil will get hot, let car seat for 1 min. and then check level (oil should be even with refiling plug) if oil coming out let it come out, if it's low and now even with refilling hole just add oil (but when u check level your whole car have to be even!!!! with rear, u can't lift front cuz oil level will not be right on level for u to check !!!!!) AND last. just like I said that kind procedure u can do by your self only between - 50-60k if it over 100k take it to shop for flush !!!!!